<?xml version="1.0" encoding="US-ASCII"?>
<!--XBRL Document Created with Wdesk from Workiva-->
<!-- -->
<link:linkbase xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedPeriodStartLabel" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedPeriodStartLabel" xlink:type="simple" />
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/netLabel" xlink:href="http://www.xbrl.org/lrr/role/net-2009-12-16.xsd#netLabel" xlink:type="simple" />
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedNetLabel" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedNetLabel" xlink:type="simple" />
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedTerseLabel" xlink:type="simple" />
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedPeriodEndLabel" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedPeriodEndLabel" xlink:type="simple" />
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedLabel" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedLabel" xlink:type="simple" />
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedTotalLabel" xlink:type="simple" />
  <link:labelLink xlink:role="http://www.xbrl.org/2003/role/link" xlink:type="extended">
    <link:label id="lab_us-gaap_RestructuringChargesAbstract_0B021BF8550BC1B63C0F2261B585E2EA_label_en-US" xlink:label="lab_us-gaap_RestructuringChargesAbstract_0B021BF8550BC1B63C0F2261B585E2EA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Restructuring Charges [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RestructuringChargesAbstract" xlink:label="loc_us-gaap_RestructuringChargesAbstract_0B021BF8550BC1B63C0F2261B585E2EA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RestructuringChargesAbstract_0B021BF8550BC1B63C0F2261B585E2EA" xlink:to="lab_us-gaap_RestructuringChargesAbstract_0B021BF8550BC1B63C0F2261B585E2EA" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_F67D441850ABAF8EE7BC2264BAFC8761_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_F67D441850ABAF8EE7BC2264BAFC8761" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Restructuring and Related Costs [Table]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_F67D441850ABAF8EE7BC2264BAFC8761_label_en-US" xlink:label="lab_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_F67D441850ABAF8EE7BC2264BAFC8761" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Restructuring and Related Costs [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_F67D441850ABAF8EE7BC2264BAFC8761" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_F67D441850ABAF8EE7BC2264BAFC8761" xlink:to="lab_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_F67D441850ABAF8EE7BC2264BAFC8761" xlink:type="arc" />
    <link:label id="lab_us-gaap_RestructuringCostAndReserveAxis_9D8CBABC972E8C0120562264BB0B32FD_terseLabel_en-US" xlink:label="lab_us-gaap_RestructuringCostAndReserveAxis_9D8CBABC972E8C0120562264BB0B32FD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Restructuring Type [Axis]</link:label>
    <link:label id="lab_us-gaap_RestructuringCostAndReserveAxis_9D8CBABC972E8C0120562264BB0B32FD_label_en-US" xlink:label="lab_us-gaap_RestructuringCostAndReserveAxis_9D8CBABC972E8C0120562264BB0B32FD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Restructuring Type [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RestructuringCostAndReserveAxis" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_9D8CBABC972E8C0120562264BB0B32FD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_9D8CBABC972E8C0120562264BB0B32FD" xlink:to="lab_us-gaap_RestructuringCostAndReserveAxis_9D8CBABC972E8C0120562264BB0B32FD" xlink:type="arc" />
    <link:label id="lab_us-gaap_TypeOfRestructuringDomain_E474F45F79BDBFECEF7A2264BB0BCE4F_terseLabel_en-US" xlink:label="lab_us-gaap_TypeOfRestructuringDomain_E474F45F79BDBFECEF7A2264BB0BCE4F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Type of Restructuring [Domain]</link:label>
    <link:label id="lab_us-gaap_TypeOfRestructuringDomain_E474F45F79BDBFECEF7A2264BB0BCE4F_label_en-US" xlink:label="lab_us-gaap_TypeOfRestructuringDomain_E474F45F79BDBFECEF7A2264BB0BCE4F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Type of Restructuring [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_TypeOfRestructuringDomain" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_E474F45F79BDBFECEF7A2264BB0BCE4F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_E474F45F79BDBFECEF7A2264BB0BCE4F" xlink:to="lab_us-gaap_TypeOfRestructuringDomain_E474F45F79BDBFECEF7A2264BB0BCE4F" xlink:type="arc" />
    <link:label id="lab_us-gaap_EmployeeSeveranceMember_F6EB15D464817BB5B8302264BB0B63FC_terseLabel_en-US" xlink:label="lab_us-gaap_EmployeeSeveranceMember_F6EB15D464817BB5B8302264BB0B63FC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2016 Workforce Reduction</link:label>
    <link:label id="lab_us-gaap_EmployeeSeveranceMember_F6EB15D464817BB5B8302264BB0B63FC_label_en-US" xlink:label="lab_us-gaap_EmployeeSeveranceMember_F6EB15D464817BB5B8302264BB0B63FC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Employee Severance [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EmployeeSeveranceMember" xlink:label="loc_us-gaap_EmployeeSeveranceMember_F6EB15D464817BB5B8302264BB0B63FC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EmployeeSeveranceMember_F6EB15D464817BB5B8302264BB0B63FC" xlink:to="lab_us-gaap_EmployeeSeveranceMember_F6EB15D464817BB5B8302264BB0B63FC" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncomeStatementLocationAxis_A3BB1D10BFC5048B86AE2264BB0D3E45_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeStatementLocationAxis_A3BB1D10BFC5048B86AE2264BB0D3E45" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Income Statement Location [Axis]</link:label>
    <link:label id="lab_us-gaap_IncomeStatementLocationAxis_A3BB1D10BFC5048B86AE2264BB0D3E45_label_en-US" xlink:label="lab_us-gaap_IncomeStatementLocationAxis_A3BB1D10BFC5048B86AE2264BB0D3E45" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Statement Location [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeStatementLocationAxis" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_A3BB1D10BFC5048B86AE2264BB0D3E45" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_A3BB1D10BFC5048B86AE2264BB0D3E45" xlink:to="lab_us-gaap_IncomeStatementLocationAxis_A3BB1D10BFC5048B86AE2264BB0D3E45" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncomeStatementLocationDomain_B1A0106102A8FE173B1F2264BB0DB488_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeStatementLocationDomain_B1A0106102A8FE173B1F2264BB0DB488" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Income Statement Location [Domain]</link:label>
    <link:label id="lab_us-gaap_IncomeStatementLocationDomain_B1A0106102A8FE173B1F2264BB0DB488_label_en-US" xlink:label="lab_us-gaap_IncomeStatementLocationDomain_B1A0106102A8FE173B1F2264BB0DB488" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Statement Location [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_B1A0106102A8FE173B1F2264BB0DB488" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_B1A0106102A8FE173B1F2264BB0DB488" xlink:to="lab_us-gaap_IncomeStatementLocationDomain_B1A0106102A8FE173B1F2264BB0DB488" xlink:type="arc" />
    <link:label id="lab_ptct_ResearchAndDevelopmentAndSellingGeneralAndAdministrativeExpensesMember_0D48B39F3A318A54C7AC2264BB0D10FC_terseLabel_en-US" xlink:label="lab_ptct_ResearchAndDevelopmentAndSellingGeneralAndAdministrativeExpensesMember_0D48B39F3A318A54C7AC2264BB0D10FC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Research and development and selling, general and administrative expenses</link:label>
    <link:label id="lab_ptct_ResearchAndDevelopmentAndSellingGeneralAndAdministrativeExpensesMember_0D48B39F3A318A54C7AC2264BB0D10FC_label_en-US" xlink:label="lab_ptct_ResearchAndDevelopmentAndSellingGeneralAndAdministrativeExpensesMember_0D48B39F3A318A54C7AC2264BB0D10FC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Research And Development And Selling General And Administrative Expenses [Member]</link:label>
    <link:label id="lab_ptct_ResearchAndDevelopmentAndSellingGeneralAndAdministrativeExpensesMember_0D48B39F3A318A54C7AC2264BB0D10FC_documentation_en-US" xlink:label="lab_ptct_ResearchAndDevelopmentAndSellingGeneralAndAdministrativeExpensesMember_0D48B39F3A318A54C7AC2264BB0D10FC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Primary financial statement caption encompassing research and development and selling, general and administrative expenses.</link:label>
    <link:loc xlink:href="ptct-20160930.xsd#ptct_ResearchAndDevelopmentAndSellingGeneralAndAdministrativeExpensesMember" xlink:label="loc_ptct_ResearchAndDevelopmentAndSellingGeneralAndAdministrativeExpensesMember_0D48B39F3A318A54C7AC2264BB0D10FC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_ResearchAndDevelopmentAndSellingGeneralAndAdministrativeExpensesMember_0D48B39F3A318A54C7AC2264BB0D10FC" xlink:to="lab_ptct_ResearchAndDevelopmentAndSellingGeneralAndAdministrativeExpensesMember_0D48B39F3A318A54C7AC2264BB0D10FC" xlink:type="arc" />
    <link:label id="lab_us-gaap_RestructuringCostAndReserveLineItems_4721EDBC2AE8B65066C92264BB0F5980_terseLabel_en-US" xlink:label="lab_us-gaap_RestructuringCostAndReserveLineItems_4721EDBC2AE8B65066C92264BB0F5980" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Restructuring Cost and Reserve [Line Items]</link:label>
    <link:label id="lab_us-gaap_RestructuringCostAndReserveLineItems_4721EDBC2AE8B65066C92264BB0F5980_label_en-US" xlink:label="lab_us-gaap_RestructuringCostAndReserveLineItems_4721EDBC2AE8B65066C92264BB0F5980" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Restructuring Cost and Reserve [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RestructuringCostAndReserveLineItems" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_4721EDBC2AE8B65066C92264BB0F5980" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_4721EDBC2AE8B65066C92264BB0F5980" xlink:to="lab_us-gaap_RestructuringCostAndReserveLineItems_4721EDBC2AE8B65066C92264BB0F5980" xlink:type="arc" />
    <link:label id="lab_us-gaap_RestructuringAndRelatedCostExpectedCost1_F65923F132FABF2381BE2261B58AC909_verboseLabel_en-US" xlink:label="lab_us-gaap_RestructuringAndRelatedCostExpectedCost1_F65923F132FABF2381BE2261B58AC909" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Work-force reduction charges</link:label>
    <link:label id="lab_us-gaap_RestructuringAndRelatedCostExpectedCost1_F65923F132FABF2381BE2261B58AC909_label_en-US" xlink:label="lab_us-gaap_RestructuringAndRelatedCostExpectedCost1_F65923F132FABF2381BE2261B58AC909" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Restructuring and Related Cost, Expected Cost</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RestructuringAndRelatedCostExpectedCost1" xlink:label="loc_us-gaap_RestructuringAndRelatedCostExpectedCost1_F65923F132FABF2381BE2261B58AC909" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RestructuringAndRelatedCostExpectedCost1_F65923F132FABF2381BE2261B58AC909" xlink:to="lab_us-gaap_RestructuringAndRelatedCostExpectedCost1_F65923F132FABF2381BE2261B58AC909" xlink:type="arc" />
    <link:label id="lab_us-gaap_RestructuringReserveRollForward_C32F95A4E1CC192DD9312261B58BE451_terseLabel_en-US" xlink:label="lab_us-gaap_RestructuringReserveRollForward_C32F95A4E1CC192DD9312261B58BE451" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Restructuring Reserve [Roll Forward]</link:label>
    <link:label id="lab_us-gaap_RestructuringReserveRollForward_C32F95A4E1CC192DD9312261B58BE451_label_en-US" xlink:label="lab_us-gaap_RestructuringReserveRollForward_C32F95A4E1CC192DD9312261B58BE451" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Restructuring Reserve [Roll Forward]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RestructuringReserveRollForward" xlink:label="loc_us-gaap_RestructuringReserveRollForward_C32F95A4E1CC192DD9312261B58BE451" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RestructuringReserveRollForward_C32F95A4E1CC192DD9312261B58BE451" xlink:to="lab_us-gaap_RestructuringReserveRollForward_C32F95A4E1CC192DD9312261B58BE451" xlink:type="arc" />
    <link:label id="lab_us-gaap_RestructuringReserve_DF0DDADBBD71092F82042261B58B693D_periodStartLabel_en-US" xlink:label="lab_us-gaap_RestructuringReserve_DF0DDADBBD71092F82042261B58B693D" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Restructuring Reserve, Beginning Balance</link:label>
    <link:label id="lab_us-gaap_RestructuringReserve_DF0DDADBBD71092F82042261B58B693D_label_en-US" xlink:label="lab_us-gaap_RestructuringReserve_DF0DDADBBD71092F82042261B58B693D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Restructuring Reserve</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RestructuringReserve" xlink:label="loc_us-gaap_RestructuringReserve_DF0DDADBBD71092F82042261B58B693D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RestructuringReserve_DF0DDADBBD71092F82042261B58B693D" xlink:to="lab_us-gaap_RestructuringReserve_DF0DDADBBD71092F82042261B58B693D" xlink:type="arc" />
    <link:label id="lab_us-gaap_RestructuringCharges_D55036034D2A015811532261B58BFC83_terseLabel_en-US" xlink:label="lab_us-gaap_RestructuringCharges_D55036034D2A015811532261B58BFC83" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Expenses, net</link:label>
    <link:label id="lab_us-gaap_RestructuringCharges_D55036034D2A015811532261B58BFC83_label_en-US" xlink:label="lab_us-gaap_RestructuringCharges_D55036034D2A015811532261B58BFC83" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Restructuring Charges</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RestructuringCharges" xlink:label="loc_us-gaap_RestructuringCharges_D55036034D2A015811532261B58BFC83" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RestructuringCharges_D55036034D2A015811532261B58BFC83" xlink:to="lab_us-gaap_RestructuringCharges_D55036034D2A015811532261B58BFC83" xlink:type="arc" />
    <link:label id="lab_us-gaap_PaymentsForRestructuring_B43F4AAD54AEA4CF74162261B58D3411_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsForRestructuring_B43F4AAD54AEA4CF74162261B58D3411" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Cash</link:label>
    <link:label id="lab_us-gaap_PaymentsForRestructuring_B43F4AAD54AEA4CF74162261B58D3411_label_en-US" xlink:label="lab_us-gaap_PaymentsForRestructuring_B43F4AAD54AEA4CF74162261B58D3411" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments for Restructuring</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsForRestructuring" xlink:label="loc_us-gaap_PaymentsForRestructuring_B43F4AAD54AEA4CF74162261B58D3411" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsForRestructuring_B43F4AAD54AEA4CF74162261B58D3411" xlink:to="lab_us-gaap_PaymentsForRestructuring_B43F4AAD54AEA4CF74162261B58D3411" xlink:type="arc" />
    <link:label id="lab_us-gaap_RestructuringReserve_FB65F67B5F8076EC19D12261B58DDA91_periodEndLabel_en-US" xlink:label="lab_us-gaap_RestructuringReserve_FB65F67B5F8076EC19D12261B58DDA91" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Restructuring Reserve, Ending Balance</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RestructuringReserve" xlink:label="loc_us-gaap_RestructuringReserve_FB65F67B5F8076EC19D12261B58DDA91" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RestructuringReserve_FB65F67B5F8076EC19D12261B58DDA91" xlink:to="lab_us-gaap_RestructuringReserve_FB65F67B5F8076EC19D12261B58DDA91" xlink:type="arc" />
    <link:label id="lab_us-gaap_PayablesAndAccrualsAbstract_FA72998BE51CAAC6EED76D888E7B01FC_label_en-US" xlink:label="lab_us-gaap_PayablesAndAccrualsAbstract_FA72998BE51CAAC6EED76D888E7B01FC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payables and Accruals [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PayablesAndAccrualsAbstract" xlink:label="loc_us-gaap_PayablesAndAccrualsAbstract_FA72998BE51CAAC6EED76D888E7B01FC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PayablesAndAccrualsAbstract_FA72998BE51CAAC6EED76D888E7B01FC" xlink:to="lab_us-gaap_PayablesAndAccrualsAbstract_FA72998BE51CAAC6EED76D888E7B01FC" xlink:type="arc" />
    <link:label id="lab_us-gaap_AccountsPayableAccruedLiabilitiesAndOtherLiabilitiesDisclosureCurrentTextBlock_D738CFC22642BCD391696D888E7BFAA9_terseLabel_en-US" xlink:label="lab_us-gaap_AccountsPayableAccruedLiabilitiesAndOtherLiabilitiesDisclosureCurrentTextBlock_D738CFC22642BCD391696D888E7BFAA9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accounts payable and accrued expenses</link:label>
    <link:label id="lab_us-gaap_AccountsPayableAccruedLiabilitiesAndOtherLiabilitiesDisclosureCurrentTextBlock_D738CFC22642BCD391696D888E7BFAA9_label_en-US" xlink:label="lab_us-gaap_AccountsPayableAccruedLiabilitiesAndOtherLiabilitiesDisclosureCurrentTextBlock_D738CFC22642BCD391696D888E7BFAA9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccountsPayableAccruedLiabilitiesAndOtherLiabilitiesDisclosureCurrentTextBlock" xlink:label="loc_us-gaap_AccountsPayableAccruedLiabilitiesAndOtherLiabilitiesDisclosureCurrentTextBlock_D738CFC22642BCD391696D888E7BFAA9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccountsPayableAccruedLiabilitiesAndOtherLiabilitiesDisclosureCurrentTextBlock_D738CFC22642BCD391696D888E7BFAA9" xlink:to="lab_us-gaap_AccountsPayableAccruedLiabilitiesAndOtherLiabilitiesDisclosureCurrentTextBlock_D738CFC22642BCD391696D888E7BFAA9" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueDisclosuresAbstract_5A9C5E2D09ED754D3AAFE8F9D9BFB940_label_en-US" xlink:label="lab_us-gaap_FairValueDisclosuresAbstract_5A9C5E2D09ED754D3AAFE8F9D9BFB940" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Disclosures [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueDisclosuresAbstract" xlink:label="loc_us-gaap_FairValueDisclosuresAbstract_5A9C5E2D09ED754D3AAFE8F9D9BFB940" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_5A9C5E2D09ED754D3AAFE8F9D9BFB940" xlink:to="lab_us-gaap_FairValueDisclosuresAbstract_5A9C5E2D09ED754D3AAFE8F9D9BFB940" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_E79CC1F801C2C84E6BC4E8F9D9BF9BE2_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_E79CC1F801C2C84E6BC4E8F9D9BF9BE2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Available-for-sale Securities [Table]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_E79CC1F801C2C84E6BC4E8F9D9BF9BE2_label_en-US" xlink:label="lab_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_E79CC1F801C2C84E6BC4E8F9D9BF9BE2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Available-for-sale Securities [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesTable" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_E79CC1F801C2C84E6BC4E8F9D9BF9BE2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_E79CC1F801C2C84E6BC4E8F9D9BF9BE2" xlink:to="lab_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_E79CC1F801C2C84E6BC4E8F9D9BF9BE2" xlink:type="arc" />
    <link:label id="lab_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_AC85E4A584D99294B29FE8F9D9BFF9CA_terseLabel_en-US" xlink:label="lab_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_AC85E4A584D99294B29FE8F9D9BFF9CA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Major Types of Debt and Equity Securities [Axis]</link:label>
    <link:label id="lab_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_AC85E4A584D99294B29FE8F9D9BFF9CA_label_en-US" xlink:label="lab_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_AC85E4A584D99294B29FE8F9D9BFF9CA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Major Types of Debt and Equity Securities [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_AC85E4A584D99294B29FE8F9D9BFF9CA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_AC85E4A584D99294B29FE8F9D9BFF9CA" xlink:to="lab_us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis_AC85E4A584D99294B29FE8F9D9BFF9CA" xlink:type="arc" />
    <link:label id="lab_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_BD4F2CD351F6D7BC6380E8F9D9BF6BE4_terseLabel_en-US" xlink:label="lab_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_BD4F2CD351F6D7BC6380E8F9D9BF6BE4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Major Types of Debt and Equity Securities [Domain]</link:label>
    <link:label id="lab_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_BD4F2CD351F6D7BC6380E8F9D9BF6BE4_label_en-US" xlink:label="lab_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_BD4F2CD351F6D7BC6380E8F9D9BF6BE4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Major Types of Debt and Equity Securities [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_BD4F2CD351F6D7BC6380E8F9D9BF6BE4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_BD4F2CD351F6D7BC6380E8F9D9BF6BE4" xlink:to="lab_us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain_BD4F2CD351F6D7BC6380E8F9D9BF6BE4" xlink:type="arc" />
    <link:label id="lab_us-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMember_816E131BE745A2B3EACFE8F9D9C08CA0_terseLabel_en-US" xlink:label="lab_us-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMember_816E131BE745A2B3EACFE8F9D9C08CA0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Commercial paper</link:label>
    <link:label id="lab_us-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMember_816E131BE745A2B3EACFE8F9D9C08CA0_label_en-US" xlink:label="lab_us-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMember_816E131BE745A2B3EACFE8F9D9C08CA0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Commercial Paper, Not Included with Cash and Cash Equivalents [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMember" xlink:label="loc_us-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMember_816E131BE745A2B3EACFE8F9D9C08CA0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMember_816E131BE745A2B3EACFE8F9D9C08CA0" xlink:to="lab_us-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMember_816E131BE745A2B3EACFE8F9D9C08CA0" xlink:type="arc" />
    <link:label id="lab_us-gaap_CorporateDebtSecuritiesMember_594DC656F73FE1421732E8F9D9C050B4_terseLabel_en-US" xlink:label="lab_us-gaap_CorporateDebtSecuritiesMember_594DC656F73FE1421732E8F9D9C050B4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Corporate debt securities</link:label>
    <link:label id="lab_us-gaap_CorporateDebtSecuritiesMember_594DC656F73FE1421732E8F9D9C050B4_label_en-US" xlink:label="lab_us-gaap_CorporateDebtSecuritiesMember_594DC656F73FE1421732E8F9D9C050B4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Corporate Debt Securities [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CorporateDebtSecuritiesMember" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_594DC656F73FE1421732E8F9D9C050B4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CorporateDebtSecuritiesMember_594DC656F73FE1421732E8F9D9C050B4" xlink:to="lab_us-gaap_CorporateDebtSecuritiesMember_594DC656F73FE1421732E8F9D9C050B4" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherDebtSecuritiesMember_E83B54ED68721BFDC3A0E8F9D9C081C6_terseLabel_en-US" xlink:label="lab_us-gaap_OtherDebtSecuritiesMember_E83B54ED68721BFDC3A0E8F9D9C081C6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Government obligations</link:label>
    <link:label id="lab_us-gaap_OtherDebtSecuritiesMember_E83B54ED68721BFDC3A0E8F9D9C081C6_label_en-US" xlink:label="lab_us-gaap_OtherDebtSecuritiesMember_E83B54ED68721BFDC3A0E8F9D9C081C6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Debt Obligations [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherDebtSecuritiesMember" xlink:label="loc_us-gaap_OtherDebtSecuritiesMember_E83B54ED68721BFDC3A0E8F9D9C081C6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherDebtSecuritiesMember_E83B54ED68721BFDC3A0E8F9D9C081C6" xlink:to="lab_us-gaap_OtherDebtSecuritiesMember_E83B54ED68721BFDC3A0E8F9D9C081C6" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_A895FFDC0D60F600FF43E8F9D9C0F927_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_A895FFDC0D60F600FF43E8F9D9C0F927" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Marketable securities accounted for as available-for-sale securities</link:label>
    <link:label id="lab_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_A895FFDC0D60F600FF43E8F9D9C0F927_label_en-US" xlink:label="lab_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_A895FFDC0D60F600FF43E8F9D9C0F927" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Available-for-sale Securities [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_A895FFDC0D60F600FF43E8F9D9C0F927" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_A895FFDC0D60F600FF43E8F9D9C0F927" xlink:to="lab_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_A895FFDC0D60F600FF43E8F9D9C0F927" xlink:type="arc" />
    <link:label id="lab_us-gaap_AvailableForSaleSecuritiesAmortizedCost_5CD61264D02C8074BBA3E8F9D9C0536C_totalLabel_en-US" xlink:label="lab_us-gaap_AvailableForSaleSecuritiesAmortizedCost_5CD61264D02C8074BBA3E8F9D9C0536C" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Amortized Cost</link:label>
    <link:label id="lab_us-gaap_AvailableForSaleSecuritiesAmortizedCost_5CD61264D02C8074BBA3E8F9D9C0536C_label_en-US" xlink:label="lab_us-gaap_AvailableForSaleSecuritiesAmortizedCost_5CD61264D02C8074BBA3E8F9D9C0536C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Available-for-sale Securities, Amortized Cost Basis</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecuritiesAmortizedCost" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesAmortizedCost_5CD61264D02C8074BBA3E8F9D9C0536C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesAmortizedCost_5CD61264D02C8074BBA3E8F9D9C0536C" xlink:to="lab_us-gaap_AvailableForSaleSecuritiesAmortizedCost_5CD61264D02C8074BBA3E8F9D9C0536C" xlink:type="arc" />
    <link:label id="lab_us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_B9DAE8937E3BF7A17B86E8F9D9C04F2D_terseLabel_en-US" xlink:label="lab_us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_B9DAE8937E3BF7A17B86E8F9D9C04F2D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Gross Unrealized Gains</link:label>
    <link:label id="lab_us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_B9DAE8937E3BF7A17B86E8F9D9C04F2D_label_en-US" xlink:label="lab_us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_B9DAE8937E3BF7A17B86E8F9D9C04F2D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_B9DAE8937E3BF7A17B86E8F9D9C04F2D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_B9DAE8937E3BF7A17B86E8F9D9C04F2D" xlink:to="lab_us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_B9DAE8937E3BF7A17B86E8F9D9C04F2D" xlink:type="arc" />
    <link:label id="lab_us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_9CB2A46921092E9842BBE8F9D9C08724_negatedLabel_en-US" xlink:label="lab_us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_9CB2A46921092E9842BBE8F9D9C08724" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Gross Unrealized Losses</link:label>
    <link:label id="lab_us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_9CB2A46921092E9842BBE8F9D9C08724_label_en-US" xlink:label="lab_us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_9CB2A46921092E9842BBE8F9D9C08724" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_9CB2A46921092E9842BBE8F9D9C08724" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_9CB2A46921092E9842BBE8F9D9C08724" xlink:to="lab_us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_9CB2A46921092E9842BBE8F9D9C08724" xlink:type="arc" />
    <link:label id="lab_us-gaap_AvailableForSaleSecurities_12B962FB77CFDC97DF2DE8F9D9C09F8C_verboseLabel_en-US" xlink:label="lab_us-gaap_AvailableForSaleSecurities_12B962FB77CFDC97DF2DE8F9D9C09F8C" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Fair Value</link:label>
    <link:label id="lab_us-gaap_AvailableForSaleSecurities_12B962FB77CFDC97DF2DE8F9D9C09F8C_label_en-US" xlink:label="lab_us-gaap_AvailableForSaleSecurities_12B962FB77CFDC97DF2DE8F9D9C09F8C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Available-for-sale Securities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecurities" xlink:label="loc_us-gaap_AvailableForSaleSecurities_12B962FB77CFDC97DF2DE8F9D9C09F8C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AvailableForSaleSecurities_12B962FB77CFDC97DF2DE8F9D9C09F8C" xlink:to="lab_us-gaap_AvailableForSaleSecurities_12B962FB77CFDC97DF2DE8F9D9C09F8C" xlink:type="arc" />
    <link:label id="lab_ptct_FairValueAssetsTransfersBetweenLevel1AndLevel2Amount_8CD44C8281CA94E0AB4CE8F9D9C0AD78_terseLabel_en-US" xlink:label="lab_ptct_FairValueAssetsTransfersBetweenLevel1AndLevel2Amount_8CD44C8281CA94E0AB4CE8F9D9C0AD78" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Transfers of assets between Level 1 and Level 2 of the fair value measurement hierarchy</link:label>
    <link:label id="lab_ptct_FairValueAssetsTransfersBetweenLevel1AndLevel2Amount_8CD44C8281CA94E0AB4CE8F9D9C0AD78_label_en-US" xlink:label="lab_ptct_FairValueAssetsTransfersBetweenLevel1AndLevel2Amount_8CD44C8281CA94E0AB4CE8F9D9C0AD78" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Assets Transfers Between Level 1 and Level 2 Amount</link:label>
    <link:label id="lab_ptct_FairValueAssetsTransfersBetweenLevel1AndLevel2Amount_8CD44C8281CA94E0AB4CE8F9D9C0AD78_documentation_en-US" xlink:label="lab_ptct_FairValueAssetsTransfersBetweenLevel1AndLevel2Amount_8CD44C8281CA94E0AB4CE8F9D9C0AD78" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Amount of transfers of assets measured on a recurring basis between Level 1 and Level 2 of the fair value hierarchy.</link:label>
    <link:loc xlink:href="ptct-20160930.xsd#ptct_FairValueAssetsTransfersBetweenLevel1AndLevel2Amount" xlink:label="loc_ptct_FairValueAssetsTransfersBetweenLevel1AndLevel2Amount_8CD44C8281CA94E0AB4CE8F9D9C0AD78" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_FairValueAssetsTransfersBetweenLevel1AndLevel2Amount_8CD44C8281CA94E0AB4CE8F9D9C0AD78" xlink:to="lab_ptct_FairValueAssetsTransfersBetweenLevel1AndLevel2Amount_8CD44C8281CA94E0AB4CE8F9D9C0AD78" xlink:type="arc" />
    <link:label id="lab_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_59D4B34D08286323309B6D888E7291A9_label_en-US" xlink:label="lab_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_59D4B34D08286323309B6D888E7291A9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of Compensation Related Costs, Share-based Payments [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract" xlink:label="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_59D4B34D08286323309B6D888E7291A9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_59D4B34D08286323309B6D888E7291A9" xlink:to="lab_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_59D4B34D08286323309B6D888E7291A9" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_B4DA98D2FEDBCE3C4B626D888E72E2C8_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_B4DA98D2FEDBCE3C4B626D888E72E2C8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Summary of stock option activity</link:label>
    <link:label id="lab_us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_B4DA98D2FEDBCE3C4B626D888E72E2C8_label_en-US" xlink:label="lab_us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_B4DA98D2FEDBCE3C4B626D888E72E2C8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_B4DA98D2FEDBCE3C4B626D888E72E2C8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_B4DA98D2FEDBCE3C4B626D888E72E2C8" xlink:to="lab_us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_B4DA98D2FEDBCE3C4B626D888E72E2C8" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock_71A51664AEBEE6A4AE7F6D888E72DE0A_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock_71A51664AEBEE6A4AE7F6D888E72DE0A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of assumptions used to estimate fair values of grants made on the date of grant</link:label>
    <link:label id="lab_us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock_71A51664AEBEE6A4AE7F6D888E72DE0A_label_en-US" xlink:label="lab_us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock_71A51664AEBEE6A4AE7F6D888E72DE0A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock_71A51664AEBEE6A4AE7F6D888E72DE0A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock_71A51664AEBEE6A4AE7F6D888E72DE0A" xlink:to="lab_us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock_71A51664AEBEE6A4AE7F6D888E72DE0A" xlink:type="arc" />
    <link:label id="lab_us-gaap_NonvestedRestrictedStockSharesActivityTableTextBlock_2F0DE3148B6A783F88CB6D888E72A333_terseLabel_en-US" xlink:label="lab_us-gaap_NonvestedRestrictedStockSharesActivityTableTextBlock_2F0DE3148B6A783F88CB6D888E72A333" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Summary of information on the Company's restricted stock</link:label>
    <link:label id="lab_us-gaap_NonvestedRestrictedStockSharesActivityTableTextBlock_2F0DE3148B6A783F88CB6D888E72A333_label_en-US" xlink:label="lab_us-gaap_NonvestedRestrictedStockSharesActivityTableTextBlock_2F0DE3148B6A783F88CB6D888E72A333" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Nonvested Restricted Stock Shares Activity [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NonvestedRestrictedStockSharesActivityTableTextBlock" xlink:label="loc_us-gaap_NonvestedRestrictedStockSharesActivityTableTextBlock_2F0DE3148B6A783F88CB6D888E72A333" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NonvestedRestrictedStockSharesActivityTableTextBlock_2F0DE3148B6A783F88CB6D888E72A333" xlink:to="lab_us-gaap_NonvestedRestrictedStockSharesActivityTableTextBlock_2F0DE3148B6A783F88CB6D888E72A333" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_4E553C25240A8F5E18AC6D888E73F40C_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_4E553C25240A8F5E18AC6D888E73F40C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of share-based compensation expense recorded in the statement of operations</link:label>
    <link:label id="lab_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_4E553C25240A8F5E18AC6D888E73F40C_label_en-US" xlink:label="lab_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_4E553C25240A8F5E18AC6D888E73F40C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock" xlink:label="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_4E553C25240A8F5E18AC6D888E73F40C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_4E553C25240A8F5E18AC6D888E73F40C" xlink:to="lab_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_4E553C25240A8F5E18AC6D888E73F40C" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_522B9F2AEF14CF46FEA1E35B9172B706_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_522B9F2AEF14CF46FEA1E35B9172B706" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value Measurements, Recurring and Nonrecurring [Table]</link:label>
    <link:label id="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_522B9F2AEF14CF46FEA1E35B9172B706_label_en-US" xlink:label="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_522B9F2AEF14CF46FEA1E35B9172B706" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Measurements, Recurring and Nonrecurring [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_522B9F2AEF14CF46FEA1E35B9172B706" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_522B9F2AEF14CF46FEA1E35B9172B706" xlink:to="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_522B9F2AEF14CF46FEA1E35B9172B706" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueByMeasurementFrequencyAxis_964C48625835C55D7C5AE35B9172C380_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueByMeasurementFrequencyAxis_964C48625835C55D7C5AE35B9172C380" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Measurement Frequency [Axis]</link:label>
    <link:label id="lab_us-gaap_FairValueByMeasurementFrequencyAxis_964C48625835C55D7C5AE35B9172C380_label_en-US" xlink:label="lab_us-gaap_FairValueByMeasurementFrequencyAxis_964C48625835C55D7C5AE35B9172C380" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Measurement Frequency [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_964C48625835C55D7C5AE35B9172C380" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_964C48625835C55D7C5AE35B9172C380" xlink:to="lab_us-gaap_FairValueByMeasurementFrequencyAxis_964C48625835C55D7C5AE35B9172C380" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueMeasurementFrequencyDomain_4340EB247A39C06ED4DEE35B91725997_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueMeasurementFrequencyDomain_4340EB247A39C06ED4DEE35B91725997" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value, Measurement Frequency [Domain]</link:label>
    <link:label id="lab_us-gaap_FairValueMeasurementFrequencyDomain_4340EB247A39C06ED4DEE35B91725997_label_en-US" xlink:label="lab_us-gaap_FairValueMeasurementFrequencyDomain_4340EB247A39C06ED4DEE35B91725997" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, Measurement Frequency [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_4340EB247A39C06ED4DEE35B91725997" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_4340EB247A39C06ED4DEE35B91725997" xlink:to="lab_us-gaap_FairValueMeasurementFrequencyDomain_4340EB247A39C06ED4DEE35B91725997" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueMeasurementsRecurringMember_1646FC6AA1193B3EE87FE35B91724A52_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueMeasurementsRecurringMember_1646FC6AA1193B3EE87FE35B91724A52" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Recurring basis</link:label>
    <link:label id="lab_us-gaap_FairValueMeasurementsRecurringMember_1646FC6AA1193B3EE87FE35B91724A52_label_en-US" xlink:label="lab_us-gaap_FairValueMeasurementsRecurringMember_1646FC6AA1193B3EE87FE35B91724A52" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, Measurements, Recurring [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_1646FC6AA1193B3EE87FE35B91724A52" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueMeasurementsRecurringMember_1646FC6AA1193B3EE87FE35B91724A52" xlink:to="lab_us-gaap_FairValueMeasurementsRecurringMember_1646FC6AA1193B3EE87FE35B91724A52" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueByFairValueHierarchyLevelAxis_8443A470AE7352F139F6E35B91727F42_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueByFairValueHierarchyLevelAxis_8443A470AE7352F139F6E35B91727F42" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value, Hierarchy [Axis]</link:label>
    <link:label id="lab_us-gaap_FairValueByFairValueHierarchyLevelAxis_8443A470AE7352F139F6E35B91727F42_label_en-US" xlink:label="lab_us-gaap_FairValueByFairValueHierarchyLevelAxis_8443A470AE7352F139F6E35B91727F42" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, Hierarchy [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_8443A470AE7352F139F6E35B91727F42" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_8443A470AE7352F139F6E35B91727F42" xlink:to="lab_us-gaap_FairValueByFairValueHierarchyLevelAxis_8443A470AE7352F139F6E35B91727F42" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_EF28D22317F2595EF502E35B9172A38C_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_EF28D22317F2595EF502E35B9172A38C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value Hierarchy [Domain]</link:label>
    <link:label id="lab_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_EF28D22317F2595EF502E35B9172A38C_label_en-US" xlink:label="lab_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_EF28D22317F2595EF502E35B9172A38C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Hierarchy [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_EF28D22317F2595EF502E35B9172A38C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_EF28D22317F2595EF502E35B9172A38C" xlink:to="lab_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_EF28D22317F2595EF502E35B9172A38C" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueInputsLevel1Member_C112794F5DE7280E6AC2E3720899247E_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel1Member_C112794F5DE7280E6AC2E3720899247E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Quoted prices in active markets for identical assets (level 1)</link:label>
    <link:label id="lab_us-gaap_FairValueInputsLevel1Member_C112794F5DE7280E6AC2E3720899247E_label_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel1Member_C112794F5DE7280E6AC2E3720899247E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, Inputs, Level 1 [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_C112794F5DE7280E6AC2E3720899247E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueInputsLevel1Member_C112794F5DE7280E6AC2E3720899247E" xlink:to="lab_us-gaap_FairValueInputsLevel1Member_C112794F5DE7280E6AC2E3720899247E" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueInputsLevel2Member_ECF153178B0D8FE53E5CE35B9172D62B_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel2Member_ECF153178B0D8FE53E5CE35B9172D62B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Significant other observable inputs (level 2)</link:label>
    <link:label id="lab_us-gaap_FairValueInputsLevel2Member_ECF153178B0D8FE53E5CE35B9172D62B_label_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel2Member_ECF153178B0D8FE53E5CE35B9172D62B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, Inputs, Level 2 [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_ECF153178B0D8FE53E5CE35B9172D62B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueInputsLevel2Member_ECF153178B0D8FE53E5CE35B9172D62B" xlink:to="lab_us-gaap_FairValueInputsLevel2Member_ECF153178B0D8FE53E5CE35B9172D62B" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueInputsLevel3Member_CA7FECECBD5601212228E35B91736472_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel3Member_CA7FECECBD5601212228E35B91736472" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Significant unobservable inputs (level 3)</link:label>
    <link:label id="lab_us-gaap_FairValueInputsLevel3Member_CA7FECECBD5601212228E35B91736472_label_en-US" xlink:label="lab_us-gaap_FairValueInputsLevel3Member_CA7FECECBD5601212228E35B91736472" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, Inputs, Level 3 [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_CA7FECECBD5601212228E35B91736472" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueInputsLevel3Member_CA7FECECBD5601212228E35B91736472" xlink:to="lab_us-gaap_FairValueInputsLevel3Member_CA7FECECBD5601212228E35B91736472" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueByMeasurementBasisAxis_A554FF66CE2FC7DF0744E35B91737E2B_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueByMeasurementBasisAxis_A554FF66CE2FC7DF0744E35B91737E2B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Measurement Basis [Axis]</link:label>
    <link:label id="lab_us-gaap_FairValueByMeasurementBasisAxis_A554FF66CE2FC7DF0744E35B91737E2B_label_en-US" xlink:label="lab_us-gaap_FairValueByMeasurementBasisAxis_A554FF66CE2FC7DF0744E35B91737E2B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Measurement Basis [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueByMeasurementBasisAxis" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_A554FF66CE2FC7DF0744E35B91737E2B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_A554FF66CE2FC7DF0744E35B91737E2B" xlink:to="lab_us-gaap_FairValueByMeasurementBasisAxis_A554FF66CE2FC7DF0744E35B91737E2B" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueDisclosureItemAmountsDomain_2E46B0CE10745189000BE367131E40F1_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueDisclosureItemAmountsDomain_2E46B0CE10745189000BE367131E40F1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value Measurement [Domain]</link:label>
    <link:label id="lab_us-gaap_FairValueDisclosureItemAmountsDomain_2E46B0CE10745189000BE367131E40F1_label_en-US" xlink:label="lab_us-gaap_FairValueDisclosureItemAmountsDomain_2E46B0CE10745189000BE367131E40F1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Measurement [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueDisclosureItemAmountsDomain" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_2E46B0CE10745189000BE367131E40F1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_2E46B0CE10745189000BE367131E40F1" xlink:to="lab_us-gaap_FairValueDisclosureItemAmountsDomain_2E46B0CE10745189000BE367131E40F1" xlink:type="arc" />
    <link:label id="lab_us-gaap_PortionAtFairValueFairValueDisclosureMember_005F3FE05E238AB639ACE35B91739804_terseLabel_en-US" xlink:label="lab_us-gaap_PortionAtFairValueFairValueDisclosureMember_005F3FE05E238AB639ACE35B91739804" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Portion at Fair Value Measurement [Member]</link:label>
    <link:label id="lab_us-gaap_PortionAtFairValueFairValueDisclosureMember_005F3FE05E238AB639ACE35B91739804_label_en-US" xlink:label="lab_us-gaap_PortionAtFairValueFairValueDisclosureMember_005F3FE05E238AB639ACE35B91739804" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Portion at Fair Value Measurement [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_005F3FE05E238AB639ACE35B91739804" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_005F3FE05E238AB639ACE35B91739804" xlink:to="lab_us-gaap_PortionAtFairValueFairValueDisclosureMember_005F3FE05E238AB639ACE35B91739804" xlink:type="arc" />
    <link:label id="lab_us-gaap_EstimateOfFairValueFairValueDisclosureMember_18E415EBABD0763F8204E35B917362E1_terseLabel_en-US" xlink:label="lab_us-gaap_EstimateOfFairValueFairValueDisclosureMember_18E415EBABD0763F8204E35B917362E1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total</link:label>
    <link:label id="lab_us-gaap_EstimateOfFairValueFairValueDisclosureMember_18E415EBABD0763F8204E35B917362E1_label_en-US" xlink:label="lab_us-gaap_EstimateOfFairValueFairValueDisclosureMember_18E415EBABD0763F8204E35B917362E1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Estimate of Fair Value Measurement [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_18E415EBABD0763F8204E35B917362E1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_18E415EBABD0763F8204E35B917362E1" xlink:to="lab_us-gaap_EstimateOfFairValueFairValueDisclosureMember_18E415EBABD0763F8204E35B917362E1" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_93D1FF80FD4F34E8BD72E35B91738F81_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_93D1FF80FD4F34E8BD72E35B91738F81" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Financial assets and liabilities measured at fair value on recurring basis</link:label>
    <link:label id="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_93D1FF80FD4F34E8BD72E35B91738F81_label_en-US" xlink:label="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_93D1FF80FD4F34E8BD72E35B91738F81" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_93D1FF80FD4F34E8BD72E35B91738F81" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_93D1FF80FD4F34E8BD72E35B91738F81" xlink:to="lab_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_93D1FF80FD4F34E8BD72E35B91738F81" xlink:type="arc" />
    <link:label id="lab_us-gaap_AvailableForSaleSecurities_ED24FDE5DAF31D199F9BE35B91734EFD_terseLabel_en-US" xlink:label="lab_us-gaap_AvailableForSaleSecurities_ED24FDE5DAF31D199F9BE35B91734EFD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Marketable securities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecurities" xlink:label="loc_us-gaap_AvailableForSaleSecurities_ED24FDE5DAF31D199F9BE35B91734EFD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AvailableForSaleSecurities_ED24FDE5DAF31D199F9BE35B91734EFD" xlink:to="lab_us-gaap_AvailableForSaleSecurities_ED24FDE5DAF31D199F9BE35B91734EFD" xlink:type="arc" />
    <link:label id="lab_us-gaap_WarrantsAndRightsOutstanding_497C2FC8B08AC16F4CAEE35B91735B7E_terseLabel_en-US" xlink:label="lab_us-gaap_WarrantsAndRightsOutstanding_497C2FC8B08AC16F4CAEE35B91735B7E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Warrant Liability</link:label>
    <link:label id="lab_us-gaap_WarrantsAndRightsOutstanding_497C2FC8B08AC16F4CAEE35B91735B7E_label_en-US" xlink:label="lab_us-gaap_WarrantsAndRightsOutstanding_497C2FC8B08AC16F4CAEE35B91735B7E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Warrants and Rights Outstanding</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_WarrantsAndRightsOutstanding" xlink:label="loc_us-gaap_WarrantsAndRightsOutstanding_497C2FC8B08AC16F4CAEE35B91735B7E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_WarrantsAndRightsOutstanding_497C2FC8B08AC16F4CAEE35B91735B7E" xlink:to="lab_us-gaap_WarrantsAndRightsOutstanding_497C2FC8B08AC16F4CAEE35B91735B7E" xlink:type="arc" />
    <link:label id="lab_ptct_StockAppreciationRightsLiabilityOutstanding_962A90147EAA72700D0DE35B91739E1C_terseLabel_en-US" xlink:label="lab_ptct_StockAppreciationRightsLiabilityOutstanding_962A90147EAA72700D0DE35B91739E1C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Stock appreciation rights liability</link:label>
    <link:label id="lab_ptct_StockAppreciationRightsLiabilityOutstanding_962A90147EAA72700D0DE35B91739E1C_label_en-US" xlink:label="lab_ptct_StockAppreciationRightsLiabilityOutstanding_962A90147EAA72700D0DE35B91739E1C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stock Appreciation Rights Liability Outstanding</link:label>
    <link:label id="lab_ptct_StockAppreciationRightsLiabilityOutstanding_962A90147EAA72700D0DE35B91739E1C_documentation_en-US" xlink:label="lab_ptct_StockAppreciationRightsLiabilityOutstanding_962A90147EAA72700D0DE35B91739E1C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the amount of outstanding stock appreciation rights liability.</link:label>
    <link:loc xlink:href="ptct-20160930.xsd#ptct_StockAppreciationRightsLiabilityOutstanding" xlink:label="loc_ptct_StockAppreciationRightsLiabilityOutstanding_962A90147EAA72700D0DE35B91739E1C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_StockAppreciationRightsLiabilityOutstanding_962A90147EAA72700D0DE35B91739E1C" xlink:to="lab_ptct_StockAppreciationRightsLiabilityOutstanding_962A90147EAA72700D0DE35B91739E1C" xlink:type="arc" />
    <link:label id="lab_us-gaap_RestructuringAndRelatedActivitiesDisclosureTextBlock_3EC68517ECB54EA9D9256D888EBF2CDF_terseLabel_en-US" xlink:label="lab_us-gaap_RestructuringAndRelatedActivitiesDisclosureTextBlock_3EC68517ECB54EA9D9256D888EBF2CDF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Restructuring</link:label>
    <link:label id="lab_us-gaap_RestructuringAndRelatedActivitiesDisclosureTextBlock_3EC68517ECB54EA9D9256D888EBF2CDF_label_en-US" xlink:label="lab_us-gaap_RestructuringAndRelatedActivitiesDisclosureTextBlock_3EC68517ECB54EA9D9256D888EBF2CDF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Restructuring and Related Activities Disclosure [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RestructuringAndRelatedActivitiesDisclosureTextBlock" xlink:label="loc_us-gaap_RestructuringAndRelatedActivitiesDisclosureTextBlock_3EC68517ECB54EA9D9256D888EBF2CDF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RestructuringAndRelatedActivitiesDisclosureTextBlock_3EC68517ECB54EA9D9256D888EBF2CDF" xlink:to="lab_us-gaap_RestructuringAndRelatedActivitiesDisclosureTextBlock_3EC68517ECB54EA9D9256D888EBF2CDF" xlink:type="arc" />
    <link:label id="lab_us-gaap_SubsequentEventsAbstract_6E1C2EAEC9AA446C22FB6D888F0171CB_label_en-US" xlink:label="lab_us-gaap_SubsequentEventsAbstract_6E1C2EAEC9AA446C22FB6D888F0171CB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Subsequent Events [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SubsequentEventsAbstract" xlink:label="loc_us-gaap_SubsequentEventsAbstract_6E1C2EAEC9AA446C22FB6D888F0171CB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SubsequentEventsAbstract_6E1C2EAEC9AA446C22FB6D888F0171CB" xlink:to="lab_us-gaap_SubsequentEventsAbstract_6E1C2EAEC9AA446C22FB6D888F0171CB" xlink:type="arc" />
    <link:label id="lab_us-gaap_SubsequentEventsTextBlock_46EBC5464A636523D9656D888F016EEB_terseLabel_en-US" xlink:label="lab_us-gaap_SubsequentEventsTextBlock_46EBC5464A636523D9656D888F016EEB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Subsequent events</link:label>
    <link:label id="lab_us-gaap_SubsequentEventsTextBlock_46EBC5464A636523D9656D888F016EEB_label_en-US" xlink:label="lab_us-gaap_SubsequentEventsTextBlock_46EBC5464A636523D9656D888F016EEB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Subsequent Events [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SubsequentEventsTextBlock" xlink:label="loc_us-gaap_SubsequentEventsTextBlock_46EBC5464A636523D9656D888F016EEB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SubsequentEventsTextBlock_46EBC5464A636523D9656D888F016EEB" xlink:to="lab_us-gaap_SubsequentEventsTextBlock_46EBC5464A636523D9656D888F016EEB" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtDisclosureAbstract_256C7A14A5FA971256AF1CF345257D70_label_en-US" xlink:label="lab_us-gaap_DebtDisclosureAbstract_256C7A14A5FA971256AF1CF345257D70" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Disclosure [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtDisclosureAbstract" xlink:label="loc_us-gaap_DebtDisclosureAbstract_256C7A14A5FA971256AF1CF345257D70" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtDisclosureAbstract_256C7A14A5FA971256AF1CF345257D70" xlink:to="lab_us-gaap_DebtDisclosureAbstract_256C7A14A5FA971256AF1CF345257D70" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentTable_81D35EAFA62F2E2A7C341CF3452564FA_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentTable_81D35EAFA62F2E2A7C341CF3452564FA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Long-term Debt Instruments [Table]</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentTable_81D35EAFA62F2E2A7C341CF3452564FA_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentTable_81D35EAFA62F2E2A7C341CF3452564FA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Long-term Debt Instruments [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_81D35EAFA62F2E2A7C341CF3452564FA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentTable_81D35EAFA62F2E2A7C341CF3452564FA" xlink:to="lab_us-gaap_DebtInstrumentTable_81D35EAFA62F2E2A7C341CF3452564FA" xlink:type="arc" />
    <link:label id="lab_us-gaap_LongtermDebtTypeAxis_2724252200037943F08F1CF345250C27_terseLabel_en-US" xlink:label="lab_us-gaap_LongtermDebtTypeAxis_2724252200037943F08F1CF345250C27" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Long-term Debt, Type [Axis]</link:label>
    <link:label id="lab_us-gaap_LongtermDebtTypeAxis_2724252200037943F08F1CF345250C27_label_en-US" xlink:label="lab_us-gaap_LongtermDebtTypeAxis_2724252200037943F08F1CF345250C27" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt, Type [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_2724252200037943F08F1CF345250C27" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_2724252200037943F08F1CF345250C27" xlink:to="lab_us-gaap_LongtermDebtTypeAxis_2724252200037943F08F1CF345250C27" xlink:type="arc" />
    <link:label id="lab_us-gaap_LongtermDebtTypeDomain_78E0F137A146308D10C11CF345258906_terseLabel_en-US" xlink:label="lab_us-gaap_LongtermDebtTypeDomain_78E0F137A146308D10C11CF345258906" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Long-term Debt, Type [Domain]</link:label>
    <link:label id="lab_us-gaap_LongtermDebtTypeDomain_78E0F137A146308D10C11CF345258906_label_en-US" xlink:label="lab_us-gaap_LongtermDebtTypeDomain_78E0F137A146308D10C11CF345258906" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt, Type [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_78E0F137A146308D10C11CF345258906" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_78E0F137A146308D10C11CF345258906" xlink:to="lab_us-gaap_LongtermDebtTypeDomain_78E0F137A146308D10C11CF345258906" xlink:type="arc" />
    <link:label id="lab_us-gaap_ConvertibleDebtMember_603EF3EA3EEDE1FEA4F51CF34525DE60_terseLabel_en-US" xlink:label="lab_us-gaap_ConvertibleDebtMember_603EF3EA3EEDE1FEA4F51CF34525DE60" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Convertible debt</link:label>
    <link:label id="lab_us-gaap_ConvertibleDebtMember_603EF3EA3EEDE1FEA4F51CF34525DE60_label_en-US" xlink:label="lab_us-gaap_ConvertibleDebtMember_603EF3EA3EEDE1FEA4F51CF34525DE60" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Convertible Debt [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ConvertibleDebtMember" xlink:label="loc_us-gaap_ConvertibleDebtMember_603EF3EA3EEDE1FEA4F51CF34525DE60" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ConvertibleDebtMember_603EF3EA3EEDE1FEA4F51CF34525DE60" xlink:to="lab_us-gaap_ConvertibleDebtMember_603EF3EA3EEDE1FEA4F51CF34525DE60" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentAxis_00282D4CE3B3634949D21CF34525C3BE_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentAxis_00282D4CE3B3634949D21CF34525C3BE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument [Axis]</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentAxis_00282D4CE3B3634949D21CF34525C3BE_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentAxis_00282D4CE3B3634949D21CF34525C3BE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_00282D4CE3B3634949D21CF34525C3BE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentAxis_00282D4CE3B3634949D21CF34525C3BE" xlink:to="lab_us-gaap_DebtInstrumentAxis_00282D4CE3B3634949D21CF34525C3BE" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentNameDomain_AE4C417C75E226FFB2B71CF3452591C4_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentNameDomain_AE4C417C75E226FFB2B71CF3452591C4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument, Name [Domain]</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentNameDomain_AE4C417C75E226FFB2B71CF3452591C4_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentNameDomain_AE4C417C75E226FFB2B71CF3452591C4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Name [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_AE4C417C75E226FFB2B71CF3452591C4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_AE4C417C75E226FFB2B71CF3452591C4" xlink:to="lab_us-gaap_DebtInstrumentNameDomain_AE4C417C75E226FFB2B71CF3452591C4" xlink:type="arc" />
    <link:label id="lab_ptct_ConvertibleSeniorNotes3.0PercentDue2022Member_BAB617397763542810031CF34525092E_terseLabel_en-US" xlink:label="lab_ptct_ConvertibleSeniorNotes3.0PercentDue2022Member_BAB617397763542810031CF34525092E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">3.00% Convertible senior notes due 2022</link:label>
    <link:label id="lab_ptct_ConvertibleSeniorNotes3.0PercentDue2022Member_BAB617397763542810031CF34525092E_label_en-US" xlink:label="lab_ptct_ConvertibleSeniorNotes3.0PercentDue2022Member_BAB617397763542810031CF34525092E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Convertible Senior Notes3.0 Percent Due2022 [Member]</link:label>
    <link:label id="lab_ptct_ConvertibleSeniorNotes3.0PercentDue2022Member_BAB617397763542810031CF34525092E_documentation_en-US" xlink:label="lab_ptct_ConvertibleSeniorNotes3.0PercentDue2022Member_BAB617397763542810031CF34525092E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the information pertaining to 3.00% convertible senior notes due 2022.</link:label>
    <link:loc xlink:href="ptct-20160930.xsd#ptct_ConvertibleSeniorNotes3.0PercentDue2022Member" xlink:label="loc_ptct_ConvertibleSeniorNotes3.0PercentDue2022Member_BAB617397763542810031CF34525092E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_ConvertibleSeniorNotes3.0PercentDue2022Member_BAB617397763542810031CF34525092E" xlink:to="lab_ptct_ConvertibleSeniorNotes3.0PercentDue2022Member_BAB617397763542810031CF34525092E" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentLineItems_BFF8076F1BC765A1CAF51CF3452606A2_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentLineItems_BFF8076F1BC765A1CAF51CF3452606A2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Long-term debt</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentLineItems_BFF8076F1BC765A1CAF51CF3452606A2_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentLineItems_BFF8076F1BC765A1CAF51CF3452606A2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_BFF8076F1BC765A1CAF51CF3452606A2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentLineItems_BFF8076F1BC765A1CAF51CF3452606A2" xlink:to="lab_us-gaap_DebtInstrumentLineItems_BFF8076F1BC765A1CAF51CF3452606A2" xlink:type="arc" />
    <link:label id="lab_us-gaap_InterestExpenseDebtExcludingAmortization_447EE24A06EA45EB7AFA1CF345260ACF_terseLabel_en-US" xlink:label="lab_us-gaap_InterestExpenseDebtExcludingAmortization_447EE24A06EA45EB7AFA1CF345260ACF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Contractual interest expense</link:label>
    <link:label id="lab_us-gaap_InterestExpenseDebtExcludingAmortization_447EE24A06EA45EB7AFA1CF345260ACF_label_en-US" xlink:label="lab_us-gaap_InterestExpenseDebtExcludingAmortization_447EE24A06EA45EB7AFA1CF345260ACF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Expense, Debt, Excluding Amortization</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InterestExpenseDebtExcludingAmortization" xlink:label="loc_us-gaap_InterestExpenseDebtExcludingAmortization_447EE24A06EA45EB7AFA1CF345260ACF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InterestExpenseDebtExcludingAmortization_447EE24A06EA45EB7AFA1CF345260ACF" xlink:to="lab_us-gaap_InterestExpenseDebtExcludingAmortization_447EE24A06EA45EB7AFA1CF345260ACF" xlink:type="arc" />
    <link:label id="lab_us-gaap_AmortizationOfFinancingCosts_8D9704F83696919CC6141CF34526C1A1_terseLabel_en-US" xlink:label="lab_us-gaap_AmortizationOfFinancingCosts_8D9704F83696919CC6141CF34526C1A1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amortization of debt issuance costs</link:label>
    <link:label id="lab_us-gaap_AmortizationOfFinancingCosts_8D9704F83696919CC6141CF34526C1A1_label_en-US" xlink:label="lab_us-gaap_AmortizationOfFinancingCosts_8D9704F83696919CC6141CF34526C1A1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Amortization of Financing Costs</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AmortizationOfFinancingCosts" xlink:label="loc_us-gaap_AmortizationOfFinancingCosts_8D9704F83696919CC6141CF34526C1A1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AmortizationOfFinancingCosts_8D9704F83696919CC6141CF34526C1A1" xlink:to="lab_us-gaap_AmortizationOfFinancingCosts_8D9704F83696919CC6141CF34526C1A1" xlink:type="arc" />
    <link:label id="lab_us-gaap_AmortizationOfDebtDiscountPremium_7769BA79E509A94980DD1CF34526D79A_terseLabel_en-US" xlink:label="lab_us-gaap_AmortizationOfDebtDiscountPremium_7769BA79E509A94980DD1CF34526D79A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amortization of debt discount</link:label>
    <link:label id="lab_us-gaap_AmortizationOfDebtDiscountPremium_7769BA79E509A94980DD1CF34526D79A_label_en-US" xlink:label="lab_us-gaap_AmortizationOfDebtDiscountPremium_7769BA79E509A94980DD1CF34526D79A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Amortization of Debt Discount (Premium)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AmortizationOfDebtDiscountPremium" xlink:label="loc_us-gaap_AmortizationOfDebtDiscountPremium_7769BA79E509A94980DD1CF34526D79A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AmortizationOfDebtDiscountPremium_7769BA79E509A94980DD1CF34526D79A" xlink:to="lab_us-gaap_AmortizationOfDebtDiscountPremium_7769BA79E509A94980DD1CF34526D79A" xlink:type="arc" />
    <link:label id="lab_us-gaap_InterestExpenseDebt_FC760541E8DA905702CA1CF345263AFB_totalLabel_en-US" xlink:label="lab_us-gaap_InterestExpenseDebt_FC760541E8DA905702CA1CF345263AFB" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total</link:label>
    <link:label id="lab_us-gaap_InterestExpenseDebt_FC760541E8DA905702CA1CF345263AFB_label_en-US" xlink:label="lab_us-gaap_InterestExpenseDebt_FC760541E8DA905702CA1CF345263AFB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Expense, Debt</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InterestExpenseDebt" xlink:label="loc_us-gaap_InterestExpenseDebt_FC760541E8DA905702CA1CF345263AFB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InterestExpenseDebt_FC760541E8DA905702CA1CF345263AFB" xlink:to="lab_us-gaap_InterestExpenseDebt_FC760541E8DA905702CA1CF345263AFB" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentInterestRateEffectivePercentage_CDE677BCF6F02498B54C1CF345264D99_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentInterestRateEffectivePercentage_CDE677BCF6F02498B54C1CF345264D99" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Effective interest rate of the liability component</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentInterestRateEffectivePercentage_CDE677BCF6F02498B54C1CF345264D99_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentInterestRateEffectivePercentage_CDE677BCF6F02498B54C1CF345264D99" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Interest Rate, Effective Percentage</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_CDE677BCF6F02498B54C1CF345264D99" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_CDE677BCF6F02498B54C1CF345264D99" xlink:to="lab_us-gaap_DebtInstrumentInterestRateEffectivePercentage_CDE677BCF6F02498B54C1CF345264D99" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_3167B3D6536B81F36B85E8F9D9071E7F_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_3167B3D6536B81F36B85E8F9D9071E7F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_3167B3D6536B81F36B85E8F9D9071E7F_label_en-US" xlink:label="lab_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_3167B3D6536B81F36B85E8F9D9071E7F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_3167B3D6536B81F36B85E8F9D9071E7F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_3167B3D6536B81F36B85E8F9D9071E7F" xlink:to="lab_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_3167B3D6536B81F36B85E8F9D9071E7F" xlink:type="arc" />
    <link:label id="lab_us-gaap_AwardTypeAxis_210A7DCEDA57249AC7C6E8F9D90DF949_terseLabel_en-US" xlink:label="lab_us-gaap_AwardTypeAxis_210A7DCEDA57249AC7C6E8F9D90DF949" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Award Type [Axis]</link:label>
    <link:label id="lab_us-gaap_AwardTypeAxis_210A7DCEDA57249AC7C6E8F9D90DF949_label_en-US" xlink:label="lab_us-gaap_AwardTypeAxis_210A7DCEDA57249AC7C6E8F9D90DF949" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Award Type [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_210A7DCEDA57249AC7C6E8F9D90DF949" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AwardTypeAxis_210A7DCEDA57249AC7C6E8F9D90DF949" xlink:to="lab_us-gaap_AwardTypeAxis_210A7DCEDA57249AC7C6E8F9D90DF949" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_76C4F2DB082546B90E7FE8F9D90DFEA4_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_76C4F2DB082546B90E7FE8F9D90DFEA4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Equity Award [Domain]</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_76C4F2DB082546B90E7FE8F9D90DFEA4_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_76C4F2DB082546B90E7FE8F9D90DFEA4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equity Award [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_76C4F2DB082546B90E7FE8F9D90DFEA4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_76C4F2DB082546B90E7FE8F9D90DFEA4" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_76C4F2DB082546B90E7FE8F9D90DFEA4" xlink:type="arc" />
    <link:label id="lab_us-gaap_StockOptionMember_31D77BD0214C81F4FE1EE8F9D90EC948_terseLabel_en-US" xlink:label="lab_us-gaap_StockOptionMember_31D77BD0214C81F4FE1EE8F9D90EC948" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Stock option</link:label>
    <link:label id="lab_us-gaap_StockOptionMember_31D77BD0214C81F4FE1EE8F9D90EC948_label_en-US" xlink:label="lab_us-gaap_StockOptionMember_31D77BD0214C81F4FE1EE8F9D90EC948" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equity Option [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockOptionMember" xlink:label="loc_us-gaap_StockOptionMember_31D77BD0214C81F4FE1EE8F9D90EC948" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockOptionMember_31D77BD0214C81F4FE1EE8F9D90EC948" xlink:to="lab_us-gaap_StockOptionMember_31D77BD0214C81F4FE1EE8F9D90EC948" xlink:type="arc" />
    <link:label id="lab_us-gaap_RangeAxis_915412F812B991B8465CE8F9D90EAE43_terseLabel_en-US" xlink:label="lab_us-gaap_RangeAxis_915412F812B991B8465CE8F9D90EAE43" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Range [Axis]</link:label>
    <link:label id="lab_us-gaap_RangeAxis_915412F812B991B8465CE8F9D90EAE43_label_en-US" xlink:label="lab_us-gaap_RangeAxis_915412F812B991B8465CE8F9D90EAE43" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Range [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_915412F812B991B8465CE8F9D90EAE43" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RangeAxis_915412F812B991B8465CE8F9D90EAE43" xlink:to="lab_us-gaap_RangeAxis_915412F812B991B8465CE8F9D90EAE43" xlink:type="arc" />
    <link:label id="lab_us-gaap_RangeMember_55DC1EBC6D6B606E91C8E8F9D90E39CB_terseLabel_en-US" xlink:label="lab_us-gaap_RangeMember_55DC1EBC6D6B606E91C8E8F9D90E39CB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Range [Domain]</link:label>
    <link:label id="lab_us-gaap_RangeMember_55DC1EBC6D6B606E91C8E8F9D90E39CB_label_en-US" xlink:label="lab_us-gaap_RangeMember_55DC1EBC6D6B606E91C8E8F9D90E39CB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Range [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_55DC1EBC6D6B606E91C8E8F9D90E39CB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RangeMember_55DC1EBC6D6B606E91C8E8F9D90E39CB" xlink:to="lab_us-gaap_RangeMember_55DC1EBC6D6B606E91C8E8F9D90E39CB" xlink:type="arc" />
    <link:label id="lab_us-gaap_MinimumMember_E7D86052487CE9D6E50DE8F9D90E91F1_terseLabel_en-US" xlink:label="lab_us-gaap_MinimumMember_E7D86052487CE9D6E50DE8F9D90E91F1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Minimum</link:label>
    <link:label id="lab_us-gaap_MinimumMember_E7D86052487CE9D6E50DE8F9D90E91F1_label_en-US" xlink:label="lab_us-gaap_MinimumMember_E7D86052487CE9D6E50DE8F9D90E91F1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Minimum [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_E7D86052487CE9D6E50DE8F9D90E91F1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_MinimumMember_E7D86052487CE9D6E50DE8F9D90E91F1" xlink:to="lab_us-gaap_MinimumMember_E7D86052487CE9D6E50DE8F9D90E91F1" xlink:type="arc" />
    <link:label id="lab_us-gaap_MaximumMember_0A528DEE39B5E04338BFE8F9D90E80A7_terseLabel_en-US" xlink:label="lab_us-gaap_MaximumMember_0A528DEE39B5E04338BFE8F9D90E80A7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Maximum</link:label>
    <link:label id="lab_us-gaap_MaximumMember_0A528DEE39B5E04338BFE8F9D90E80A7_label_en-US" xlink:label="lab_us-gaap_MaximumMember_0A528DEE39B5E04338BFE8F9D90E80A7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Maximum [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_0A528DEE39B5E04338BFE8F9D90E80A7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_MaximumMember_0A528DEE39B5E04338BFE8F9D90E80A7" xlink:to="lab_us-gaap_MaximumMember_0A528DEE39B5E04338BFE8F9D90E80A7" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_79F0CF8B786A822B8DE7E8F9D90E260F_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_79F0CF8B786A822B8DE7E8F9D90E260F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Stock option plan</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_79F0CF8B786A822B8DE7E8F9D90E260F_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_79F0CF8B786A822B8DE7E8F9D90E260F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_79F0CF8B786A822B8DE7E8F9D90E260F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_79F0CF8B786A822B8DE7E8F9D90E260F" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_79F0CF8B786A822B8DE7E8F9D90E260F" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_71ED86D22F77B588F3B7E8F9D90E04EB_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_71ED86D22F77B588F3B7E8F9D90E04EB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of options</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_71ED86D22F77B588F3B7E8F9D90E04EB_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_71ED86D22F77B588F3B7E8F9D90E04EB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_71ED86D22F77B588F3B7E8F9D90E04EB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_71ED86D22F77B588F3B7E8F9D90E04EB" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_71ED86D22F77B588F3B7E8F9D90E04EB" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_4DE08EE698725F4A759CE8F9D90FE6CD_periodStartLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_4DE08EE698725F4A759CE8F9D90FE6CD" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Outstanding at the beginning of the period (in shares)</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_4DE08EE698725F4A759CE8F9D90FE6CD_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_4DE08EE698725F4A759CE8F9D90FE6CD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_4DE08EE698725F4A759CE8F9D90FE6CD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_4DE08EE698725F4A759CE8F9D90FE6CD" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_4DE08EE698725F4A759CE8F9D90FE6CD" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_12E155EBC92796673C0EE8F9D90FFC8B_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_12E155EBC92796673C0EE8F9D90FFC8B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Granted (in shares)</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_12E155EBC92796673C0EE8F9D90FFC8B_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_12E155EBC92796673C0EE8F9D90FFC8B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_12E155EBC92796673C0EE8F9D90FFC8B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_12E155EBC92796673C0EE8F9D90FFC8B" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_12E155EBC92796673C0EE8F9D90FFC8B" xlink:type="arc" />
    <link:label id="lab_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_32B86BC096AE065B8D33E8F9D91404FE_negatedLabel_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_32B86BC096AE065B8D33E8F9D91404FE" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Exercised (in shares)</link:label>
    <link:label id="lab_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_32B86BC096AE065B8D33E8F9D91404FE_label_en-US" xlink:label="lab_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_32B86BC096AE065B8D33E8F9D91404FE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_32B86BC096AE065B8D33E8F9D91404FE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_32B86BC096AE065B8D33E8F9D91404FE" xlink:to="lab_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_32B86BC096AE065B8D33E8F9D91404FE" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_869F46037AF43C4B8480E8F9D914B427_negatedLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_869F46037AF43C4B8480E8F9D914B427" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Forfeited/Cancelled (in shares)</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_869F46037AF43C4B8480E8F9D914B427_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_869F46037AF43C4B8480E8F9D914B427" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_869F46037AF43C4B8480E8F9D914B427" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_869F46037AF43C4B8480E8F9D914B427" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_869F46037AF43C4B8480E8F9D914B427" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_581EC6CFB580E2B7491EE8F9D9148A1E_periodEndLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_581EC6CFB580E2B7491EE8F9D9148A1E" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Outstanding at the end of the period (in shares)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_581EC6CFB580E2B7491EE8F9D9148A1E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_581EC6CFB580E2B7491EE8F9D9148A1E" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_581EC6CFB580E2B7491EE8F9D9148A1E" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber_48F2BBADD762BA8E5A48E8F9D914B290_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber_48F2BBADD762BA8E5A48E8F9D914B290" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Vested or Expected to vest at the end of the period (in shares)</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber_48F2BBADD762BA8E5A48E8F9D914B290_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber_48F2BBADD762BA8E5A48E8F9D914B290" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber_48F2BBADD762BA8E5A48E8F9D914B290" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber_48F2BBADD762BA8E5A48E8F9D914B290" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber_48F2BBADD762BA8E5A48E8F9D914B290" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_417981CAFE1F83004329E8F9D91537D4_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_417981CAFE1F83004329E8F9D91537D4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Exercisable at the end of the period (in shares)</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_417981CAFE1F83004329E8F9D91537D4_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_417981CAFE1F83004329E8F9D91537D4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_417981CAFE1F83004329E8F9D91537D4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_417981CAFE1F83004329E8F9D91537D4" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_417981CAFE1F83004329E8F9D91537D4" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_5C2335E79A8B961D182CE8F9D915C35D_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_5C2335E79A8B961D182CE8F9D915C35D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Weighted-average exercise price</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_5C2335E79A8B961D182CE8F9D915C35D_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_5C2335E79A8B961D182CE8F9D915C35D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_5C2335E79A8B961D182CE8F9D915C35D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_5C2335E79A8B961D182CE8F9D915C35D" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_5C2335E79A8B961D182CE8F9D915C35D" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_1AA05EFA4B8FD6AC87D9E8F9D9158DB2_periodStartLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_1AA05EFA4B8FD6AC87D9E8F9D9158DB2" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Outstanding at the beginning of the period (in dollars per share)</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_1AA05EFA4B8FD6AC87D9E8F9D9158DB2_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_1AA05EFA4B8FD6AC87D9E8F9D9158DB2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_1AA05EFA4B8FD6AC87D9E8F9D9158DB2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_1AA05EFA4B8FD6AC87D9E8F9D9158DB2" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_1AA05EFA4B8FD6AC87D9E8F9D9158DB2" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_8CFA56546298662E04C9E8F9D915AF33_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_8CFA56546298662E04C9E8F9D915AF33" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Granted (in dollars per share)</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_8CFA56546298662E04C9E8F9D915AF33_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_8CFA56546298662E04C9E8F9D915AF33" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_8CFA56546298662E04C9E8F9D915AF33" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_8CFA56546298662E04C9E8F9D915AF33" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_8CFA56546298662E04C9E8F9D915AF33" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_FA60852D9CDC3542F138E8F9D915BEE0_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_FA60852D9CDC3542F138E8F9D915BEE0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Exercised (in dollars per share)</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_FA60852D9CDC3542F138E8F9D915BEE0_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_FA60852D9CDC3542F138E8F9D915BEE0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_FA60852D9CDC3542F138E8F9D915BEE0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_FA60852D9CDC3542F138E8F9D915BEE0" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_FA60852D9CDC3542F138E8F9D915BEE0" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_4061F859001D78AD2FA5E8F9D915296F_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_4061F859001D78AD2FA5E8F9D915296F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Forfeited/Cancelled (in dollars per share)</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_4061F859001D78AD2FA5E8F9D915296F_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_4061F859001D78AD2FA5E8F9D915296F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_4061F859001D78AD2FA5E8F9D915296F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_4061F859001D78AD2FA5E8F9D915296F" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_4061F859001D78AD2FA5E8F9D915296F" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_AF0B82B10AF5898ADAFDE8F9D9154704_periodEndLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_AF0B82B10AF5898ADAFDE8F9D9154704" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Outstanding at the end of the period (in dollars per share)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_AF0B82B10AF5898ADAFDE8F9D9154704" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_AF0B82B10AF5898ADAFDE8F9D9154704" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_AF0B82B10AF5898ADAFDE8F9D9154704" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice_C91D407D065FFAD17FFAE8F9D915CEFA_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice_C91D407D065FFAD17FFAE8F9D915CEFA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Vested or Expected to vest at the end of the period (in dollars per share)</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice_C91D407D065FFAD17FFAE8F9D915CEFA_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice_C91D407D065FFAD17FFAE8F9D915CEFA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice_C91D407D065FFAD17FFAE8F9D915CEFA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice_C91D407D065FFAD17FFAE8F9D915CEFA" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice_C91D407D065FFAD17FFAE8F9D915CEFA" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_77A122DC4E0D54FD0EBEE8F9D915B846_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_77A122DC4E0D54FD0EBEE8F9D915B846" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Exercisable at the end of the period (in dollars per share)</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_77A122DC4E0D54FD0EBEE8F9D915B846_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_77A122DC4E0D54FD0EBEE8F9D915B846" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_77A122DC4E0D54FD0EBEE8F9D915B846" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_77A122DC4E0D54FD0EBEE8F9D915B846" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_77A122DC4E0D54FD0EBEE8F9D915B846" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_23408C8A33D768B4C645E8F9D9150B00_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_23408C8A33D768B4C645E8F9D9150B00" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Weighted-average remaining contractual term</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_23408C8A33D768B4C645E8F9D9150B00_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_23408C8A33D768B4C645E8F9D9150B00" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_23408C8A33D768B4C645E8F9D9150B00" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_23408C8A33D768B4C645E8F9D9150B00" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_23408C8A33D768B4C645E8F9D9150B00" xlink:type="arc" />
    <link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_1E9AFEF5E5CACB881388E8F9D9159CE8_terseLabel_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_1E9AFEF5E5CACB881388E8F9D9159CE8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Outstanding at the end of the period</link:label>
    <link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_1E9AFEF5E5CACB881388E8F9D9159CE8_label_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_1E9AFEF5E5CACB881388E8F9D9159CE8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_1E9AFEF5E5CACB881388E8F9D9159CE8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_1E9AFEF5E5CACB881388E8F9D9159CE8" xlink:to="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_1E9AFEF5E5CACB881388E8F9D9159CE8" xlink:type="arc" />
    <link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1_556A48CB2A79B36E5C98E8F9D9156B48_terseLabel_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1_556A48CB2A79B36E5C98E8F9D9156B48" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Vested or Expected to vest at the end of the period</link:label>
    <link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1_556A48CB2A79B36E5C98E8F9D9156B48_label_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1_556A48CB2A79B36E5C98E8F9D9156B48" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1_556A48CB2A79B36E5C98E8F9D9156B48" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1_556A48CB2A79B36E5C98E8F9D9156B48" xlink:to="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1_556A48CB2A79B36E5C98E8F9D9156B48" xlink:type="arc" />
    <link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_8F7201057DC2C15257B0E8F9D9153CB7_terseLabel_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_8F7201057DC2C15257B0E8F9D9153CB7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Exercisable at the end of the period</link:label>
    <link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_8F7201057DC2C15257B0E8F9D9153CB7_label_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_8F7201057DC2C15257B0E8F9D9153CB7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_8F7201057DC2C15257B0E8F9D9153CB7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_8F7201057DC2C15257B0E8F9D9153CB7" xlink:to="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_8F7201057DC2C15257B0E8F9D9153CB7" xlink:type="arc" />
    <link:label id="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsIntrinsicValueRollForward_D3BB7E09C13147E77D2BE8F9D91562CC_terseLabel_en-US" xlink:label="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsIntrinsicValueRollForward_D3BB7E09C13147E77D2BE8F9D91562CC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Aggregate intrinsic value</link:label>
    <link:label id="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsIntrinsicValueRollForward_D3BB7E09C13147E77D2BE8F9D91562CC_label_en-US" xlink:label="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsIntrinsicValueRollForward_D3BB7E09C13147E77D2BE8F9D91562CC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share Based Compensation Arrangement by Share Based Payment Award Options Intrinsic Value [Roll Forward]</link:label>
    <link:label id="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsIntrinsicValueRollForward_D3BB7E09C13147E77D2BE8F9D91562CC_documentation_en-US" xlink:label="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsIntrinsicValueRollForward_D3BB7E09C13147E77D2BE8F9D91562CC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US" />
    <link:loc xlink:href="ptct-20160930.xsd#ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsIntrinsicValueRollForward" xlink:label="loc_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsIntrinsicValueRollForward_D3BB7E09C13147E77D2BE8F9D91562CC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsIntrinsicValueRollForward_D3BB7E09C13147E77D2BE8F9D91562CC" xlink:to="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsIntrinsicValueRollForward_D3BB7E09C13147E77D2BE8F9D91562CC" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_3BDB7074AD4305C12F92E8F9D916D8F4_periodEndLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_3BDB7074AD4305C12F92E8F9D916D8F4" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Outstanding at the end of the period (in dollars)</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_3BDB7074AD4305C12F92E8F9D916D8F4_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_3BDB7074AD4305C12F92E8F9D916D8F4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_3BDB7074AD4305C12F92E8F9D916D8F4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_3BDB7074AD4305C12F92E8F9D916D8F4" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_3BDB7074AD4305C12F92E8F9D916D8F4" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue_E92FE60DDB7C7AF09175E8F9D916DCF3_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue_E92FE60DDB7C7AF09175E8F9D916DCF3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Vested or Expected to vest at the end of the period (in dollars)</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue_E92FE60DDB7C7AF09175E8F9D916DCF3_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue_E92FE60DDB7C7AF09175E8F9D916DCF3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue_E92FE60DDB7C7AF09175E8F9D916DCF3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue_E92FE60DDB7C7AF09175E8F9D916DCF3" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue_E92FE60DDB7C7AF09175E8F9D916DCF3" xlink:type="arc" />
    <link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_383BAD72CCD69399C39FE90A1CB147B7_terseLabel_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_383BAD72CCD69399C39FE90A1CB147B7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Exercisable at the end of the period (in dollars)</link:label>
    <link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_383BAD72CCD69399C39FE90A1CB147B7_label_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_383BAD72CCD69399C39FE90A1CB147B7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_383BAD72CCD69399C39FE90A1CB147B7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_383BAD72CCD69399C39FE90A1CB147B7" xlink:to="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_383BAD72CCD69399C39FE90A1CB147B7" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_09B9C96E20653DF455F8E8F9D916F93B_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_09B9C96E20653DF455F8E8F9D916F93B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Valuation assumptions</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_09B9C96E20653DF455F8E8F9D916F93B_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_09B9C96E20653DF455F8E8F9D916F93B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_09B9C96E20653DF455F8E8F9D916F93B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_09B9C96E20653DF455F8E8F9D916F93B" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_09B9C96E20653DF455F8E8F9D916F93B" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_490C7D8FF88539D05C9FE8F9D9163BAB_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_490C7D8FF88539D05C9FE8F9D9163BAB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Risk-free interest rate (as a percent)</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_490C7D8FF88539D05C9FE8F9D9163BAB_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_490C7D8FF88539D05C9FE8F9D9163BAB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_490C7D8FF88539D05C9FE8F9D9163BAB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_490C7D8FF88539D05C9FE8F9D9163BAB" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_490C7D8FF88539D05C9FE8F9D9163BAB" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_BEB854CFD84CC4A01061E8F9D916CDC2_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_BEB854CFD84CC4A01061E8F9D916CDC2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Expected volatility (as a percent)</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_BEB854CFD84CC4A01061E8F9D916CDC2_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_BEB854CFD84CC4A01061E8F9D916CDC2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_BEB854CFD84CC4A01061E8F9D916CDC2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_BEB854CFD84CC4A01061E8F9D916CDC2" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_BEB854CFD84CC4A01061E8F9D916CDC2" xlink:type="arc" />
    <link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_9BA4BF05CB2F36656DD4E8F9D916B052_terseLabel_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_9BA4BF05CB2F36656DD4E8F9D916B052" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Expected term</link:label>
    <link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_9BA4BF05CB2F36656DD4E8F9D916B052_label_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_9BA4BF05CB2F36656DD4E8F9D916B052" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_9BA4BF05CB2F36656DD4E8F9D916B052" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_9BA4BF05CB2F36656DD4E8F9D916B052" xlink:to="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_9BA4BF05CB2F36656DD4E8F9D916B052" xlink:type="arc" />
    <link:label id="lab_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_557A0FEEBA95313E449C216117571756_label_en-US" xlink:label="lab_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_557A0FEEBA95313E449C216117571756" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Organization, Consolidation and Presentation of Financial Statements [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract" xlink:label="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_557A0FEEBA95313E449C216117571756" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_557A0FEEBA95313E449C216117571756" xlink:to="lab_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_557A0FEEBA95313E449C216117571756" xlink:type="arc" />
    <link:label id="lab_us-gaap_NatureOfOperations_510D182B39DF1BD2479921611757C468_terseLabel_en-US" xlink:label="lab_us-gaap_NatureOfOperations_510D182B39DF1BD2479921611757C468" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">The Company</link:label>
    <link:label id="lab_us-gaap_NatureOfOperations_510D182B39DF1BD2479921611757C468_label_en-US" xlink:label="lab_us-gaap_NatureOfOperations_510D182B39DF1BD2479921611757C468" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Nature of Operations [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NatureOfOperations" xlink:label="loc_us-gaap_NatureOfOperations_510D182B39DF1BD2479921611757C468" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NatureOfOperations_510D182B39DF1BD2479921611757C468" xlink:to="lab_us-gaap_NatureOfOperations_510D182B39DF1BD2479921611757C468" xlink:type="arc" />
    <link:label id="lab_us-gaap_StatementOfFinancialPositionAbstract_409D36FC7B01DD21BD651CF345FF8861_label_en-US" xlink:label="lab_us-gaap_StatementOfFinancialPositionAbstract_409D36FC7B01DD21BD651CF345FF8861" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement of Financial Position [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementOfFinancialPositionAbstract" xlink:label="loc_us-gaap_StatementOfFinancialPositionAbstract_409D36FC7B01DD21BD651CF345FF8861" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StatementOfFinancialPositionAbstract_409D36FC7B01DD21BD651CF345FF8861" xlink:to="lab_us-gaap_StatementOfFinancialPositionAbstract_409D36FC7B01DD21BD651CF345FF8861" xlink:type="arc" />
    <link:label id="lab_us-gaap_CommonStockParOrStatedValuePerShare_0B54A7E37053AD8C2BA01CF345FF1CAC_terseLabel_en-US" xlink:label="lab_us-gaap_CommonStockParOrStatedValuePerShare_0B54A7E37053AD8C2BA01CF345FF1CAC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Common stock, par value (in dollars per share)</link:label>
    <link:label id="lab_us-gaap_CommonStockParOrStatedValuePerShare_0B54A7E37053AD8C2BA01CF345FF1CAC_label_en-US" xlink:label="lab_us-gaap_CommonStockParOrStatedValuePerShare_0B54A7E37053AD8C2BA01CF345FF1CAC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Common Stock, Par or Stated Value Per Share</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_0B54A7E37053AD8C2BA01CF345FF1CAC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommonStockParOrStatedValuePerShare_0B54A7E37053AD8C2BA01CF345FF1CAC" xlink:to="lab_us-gaap_CommonStockParOrStatedValuePerShare_0B54A7E37053AD8C2BA01CF345FF1CAC" xlink:type="arc" />
    <link:label id="lab_us-gaap_CommonStockSharesAuthorized_0BBEA6A11F4A00C7BDFA1CF345FF8D9C_terseLabel_en-US" xlink:label="lab_us-gaap_CommonStockSharesAuthorized_0BBEA6A11F4A00C7BDFA1CF345FF8D9C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Common stock, authorized shares (in shares)</link:label>
    <link:label id="lab_us-gaap_CommonStockSharesAuthorized_0BBEA6A11F4A00C7BDFA1CF345FF8D9C_label_en-US" xlink:label="lab_us-gaap_CommonStockSharesAuthorized_0BBEA6A11F4A00C7BDFA1CF345FF8D9C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Common Stock, Shares Authorized</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonStockSharesAuthorized" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_0BBEA6A11F4A00C7BDFA1CF345FF8D9C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommonStockSharesAuthorized_0BBEA6A11F4A00C7BDFA1CF345FF8D9C" xlink:to="lab_us-gaap_CommonStockSharesAuthorized_0BBEA6A11F4A00C7BDFA1CF345FF8D9C" xlink:type="arc" />
    <link:label id="lab_us-gaap_CommonStockSharesIssued_FBF22F4DE72D1C1E89FB1CF345FFAD46_terseLabel_en-US" xlink:label="lab_us-gaap_CommonStockSharesIssued_FBF22F4DE72D1C1E89FB1CF345FFAD46" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Common stock, issued shares (in shares)</link:label>
    <link:label id="lab_us-gaap_CommonStockSharesIssued_FBF22F4DE72D1C1E89FB1CF345FFAD46_label_en-US" xlink:label="lab_us-gaap_CommonStockSharesIssued_FBF22F4DE72D1C1E89FB1CF345FFAD46" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Common Stock, Shares, Issued</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonStockSharesIssued" xlink:label="loc_us-gaap_CommonStockSharesIssued_FBF22F4DE72D1C1E89FB1CF345FFAD46" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommonStockSharesIssued_FBF22F4DE72D1C1E89FB1CF345FFAD46" xlink:to="lab_us-gaap_CommonStockSharesIssued_FBF22F4DE72D1C1E89FB1CF345FFAD46" xlink:type="arc" />
    <link:label id="lab_us-gaap_CommonStockSharesOutstanding_B811630BF863BD53460B1CF345FF48A2_terseLabel_en-US" xlink:label="lab_us-gaap_CommonStockSharesOutstanding_B811630BF863BD53460B1CF345FF48A2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Common stock, outstanding shares (in shares)</link:label>
    <link:label id="lab_us-gaap_CommonStockSharesOutstanding_B811630BF863BD53460B1CF345FF48A2_label_en-US" xlink:label="lab_us-gaap_CommonStockSharesOutstanding_B811630BF863BD53460B1CF345FF48A2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Common Stock, Shares, Outstanding</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonStockSharesOutstanding" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_B811630BF863BD53460B1CF345FF48A2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommonStockSharesOutstanding_B811630BF863BD53460B1CF345FF48A2" xlink:to="lab_us-gaap_CommonStockSharesOutstanding_B811630BF863BD53460B1CF345FF48A2" xlink:type="arc" />
    <link:label id="lab_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_FE70CFD06CE8D6AC41531CF345F4F0B0_label_en-US" xlink:label="lab_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_FE70CFD06CE8D6AC41531CF345F4F0B0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement of Comprehensive Income [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract" xlink:label="loc_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_FE70CFD06CE8D6AC41531CF345F4F0B0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_FE70CFD06CE8D6AC41531CF345F4F0B0" xlink:to="lab_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_FE70CFD06CE8D6AC41531CF345F4F0B0" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetIncomeLoss_753E77C2705D5E4FB06A1CF345F4703F_terseLabel_en-US" xlink:label="lab_us-gaap_NetIncomeLoss_753E77C2705D5E4FB06A1CF345F4703F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net loss</link:label>
    <link:label id="lab_us-gaap_NetIncomeLoss_753E77C2705D5E4FB06A1CF345F4703F_label_en-US" xlink:label="lab_us-gaap_NetIncomeLoss_753E77C2705D5E4FB06A1CF345F4703F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Income (Loss) Attributable to Parent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_753E77C2705D5E4FB06A1CF345F4703F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetIncomeLoss_753E77C2705D5E4FB06A1CF345F4703F" xlink:to="lab_us-gaap_NetIncomeLoss_753E77C2705D5E4FB06A1CF345F4703F" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract_16859ED4A7DAA2FAE0391CF345F4F6C9_verboseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract_16859ED4A7DAA2FAE0391CF345F4F6C9" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Other comprehensive loss:</link:label>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract_16859ED4A7DAA2FAE0391CF345F4F6C9_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract_16859ED4A7DAA2FAE0391CF345F4F6C9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract_16859ED4A7DAA2FAE0391CF345F4F6C9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract_16859ED4A7DAA2FAE0391CF345F4F6C9" xlink:to="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract_16859ED4A7DAA2FAE0391CF345F4F6C9" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent_CF51B795BF968BD1E83E1CF345F45E37_terseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent_CF51B795BF968BD1E83E1CF345F45E37" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unrealized (loss) gain on marketable securities, net of tax</link:label>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent_CF51B795BF968BD1E83E1CF345F45E37_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent_CF51B795BF968BD1E83E1CF345F45E37" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent" xlink:label="loc_us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent_CF51B795BF968BD1E83E1CF345F45E37" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent_CF51B795BF968BD1E83E1CF345F45E37" xlink:to="lab_us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent_CF51B795BF968BD1E83E1CF345F45E37" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_0844659D3513A0C4915C1CF345F4F35E_verboseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_0844659D3513A0C4915C1CF345F4F35E" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Foreign currency translation gain (loss)</link:label>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_0844659D3513A0C4915C1CF345F4F35E_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_0844659D3513A0C4915C1CF345F4F35E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent" xlink:label="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_0844659D3513A0C4915C1CF345F4F35E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_0844659D3513A0C4915C1CF345F4F35E" xlink:to="lab_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_0844659D3513A0C4915C1CF345F4F35E" xlink:type="arc" />
    <link:label id="lab_us-gaap_ComprehensiveIncomeNetOfTax_96B89F16F48B20C6D6F41CF345F473DD_totalLabel_en-US" xlink:label="lab_us-gaap_ComprehensiveIncomeNetOfTax_96B89F16F48B20C6D6F41CF345F473DD" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Comprehensive loss</link:label>
    <link:label id="lab_us-gaap_ComprehensiveIncomeNetOfTax_96B89F16F48B20C6D6F41CF345F473DD_label_en-US" xlink:label="lab_us-gaap_ComprehensiveIncomeNetOfTax_96B89F16F48B20C6D6F41CF345F473DD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Comprehensive Income (Loss), Net of Tax, Attributable to Parent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_96B89F16F48B20C6D6F41CF345F473DD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_96B89F16F48B20C6D6F41CF345F473DD" xlink:to="lab_us-gaap_ComprehensiveIncomeNetOfTax_96B89F16F48B20C6D6F41CF345F473DD" xlink:type="arc" />
    <link:label id="lab_us-gaap_StockholdersEquityNoteAbstract_6D44778207A91BAE6442E35B907C1B9A_label_en-US" xlink:label="lab_us-gaap_StockholdersEquityNoteAbstract_6D44778207A91BAE6442E35B907C1B9A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stockholders' Equity Note [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockholdersEquityNoteAbstract" xlink:label="loc_us-gaap_StockholdersEquityNoteAbstract_6D44778207A91BAE6442E35B907C1B9A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockholdersEquityNoteAbstract_6D44778207A91BAE6442E35B907C1B9A" xlink:to="lab_us-gaap_StockholdersEquityNoteAbstract_6D44778207A91BAE6442E35B907C1B9A" xlink:type="arc" />
    <link:label id="lab_us-gaap_ClassOfWarrantOrRightTable_596AF3165715087A5DE8E35B907D87CC_terseLabel_en-US" xlink:label="lab_us-gaap_ClassOfWarrantOrRightTable_596AF3165715087A5DE8E35B907D87CC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Class of Warrant or Right [Table]</link:label>
    <link:label id="lab_us-gaap_ClassOfWarrantOrRightTable_596AF3165715087A5DE8E35B907D87CC_label_en-US" xlink:label="lab_us-gaap_ClassOfWarrantOrRightTable_596AF3165715087A5DE8E35B907D87CC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Class of Warrant or Right [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ClassOfWarrantOrRightTable" xlink:label="loc_us-gaap_ClassOfWarrantOrRightTable_596AF3165715087A5DE8E35B907D87CC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ClassOfWarrantOrRightTable_596AF3165715087A5DE8E35B907D87CC" xlink:to="lab_us-gaap_ClassOfWarrantOrRightTable_596AF3165715087A5DE8E35B907D87CC" xlink:type="arc" />
    <link:label id="lab_us-gaap_ClassOfWarrantOrRightAxis_1E9B1E5375074FE83909E35B907DBFAC_terseLabel_en-US" xlink:label="lab_us-gaap_ClassOfWarrantOrRightAxis_1E9B1E5375074FE83909E35B907DBFAC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Class of Warrant or Right [Axis]</link:label>
    <link:label id="lab_us-gaap_ClassOfWarrantOrRightAxis_1E9B1E5375074FE83909E35B907DBFAC_label_en-US" xlink:label="lab_us-gaap_ClassOfWarrantOrRightAxis_1E9B1E5375074FE83909E35B907DBFAC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Class of Warrant or Right [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ClassOfWarrantOrRightAxis" xlink:label="loc_us-gaap_ClassOfWarrantOrRightAxis_1E9B1E5375074FE83909E35B907DBFAC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ClassOfWarrantOrRightAxis_1E9B1E5375074FE83909E35B907DBFAC" xlink:to="lab_us-gaap_ClassOfWarrantOrRightAxis_1E9B1E5375074FE83909E35B907DBFAC" xlink:type="arc" />
    <link:label id="lab_us-gaap_ClassOfWarrantOrRightDomain_2D0FB4482187B2EA0EA3E35B907D55CE_terseLabel_en-US" xlink:label="lab_us-gaap_ClassOfWarrantOrRightDomain_2D0FB4482187B2EA0EA3E35B907D55CE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Class of Warrant or Right [Domain]</link:label>
    <link:label id="lab_us-gaap_ClassOfWarrantOrRightDomain_2D0FB4482187B2EA0EA3E35B907D55CE_label_en-US" xlink:label="lab_us-gaap_ClassOfWarrantOrRightDomain_2D0FB4482187B2EA0EA3E35B907D55CE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Class of Warrant or Right [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ClassOfWarrantOrRightDomain" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_2D0FB4482187B2EA0EA3E35B907D55CE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ClassOfWarrantOrRightDomain_2D0FB4482187B2EA0EA3E35B907D55CE" xlink:to="lab_us-gaap_ClassOfWarrantOrRightDomain_2D0FB4482187B2EA0EA3E35B907D55CE" xlink:type="arc" />
    <link:label id="lab_us-gaap_WarrantMember_2B2E298D6260F81A31B5E35B907DD7D2_terseLabel_en-US" xlink:label="lab_us-gaap_WarrantMember_2B2E298D6260F81A31B5E35B907DD7D2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Warrants</link:label>
    <link:label id="lab_us-gaap_WarrantMember_2B2E298D6260F81A31B5E35B907DD7D2_label_en-US" xlink:label="lab_us-gaap_WarrantMember_2B2E298D6260F81A31B5E35B907DD7D2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Warrant [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_WarrantMember" xlink:label="loc_us-gaap_WarrantMember_2B2E298D6260F81A31B5E35B907DD7D2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_WarrantMember_2B2E298D6260F81A31B5E35B907DD7D2" xlink:to="lab_us-gaap_WarrantMember_2B2E298D6260F81A31B5E35B907DD7D2" xlink:type="arc" />
    <link:label id="lab_us-gaap_StatementClassOfStockAxis_24232449F4B01DA02B6BE35B907D4450_terseLabel_en-US" xlink:label="lab_us-gaap_StatementClassOfStockAxis_24232449F4B01DA02B6BE35B907D4450" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Class of Stock [Axis]</link:label>
    <link:label id="lab_us-gaap_StatementClassOfStockAxis_24232449F4B01DA02B6BE35B907D4450_label_en-US" xlink:label="lab_us-gaap_StatementClassOfStockAxis_24232449F4B01DA02B6BE35B907D4450" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Class of Stock [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_24232449F4B01DA02B6BE35B907D4450" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StatementClassOfStockAxis_24232449F4B01DA02B6BE35B907D4450" xlink:to="lab_us-gaap_StatementClassOfStockAxis_24232449F4B01DA02B6BE35B907D4450" xlink:type="arc" />
    <link:label id="lab_us-gaap_ClassOfStockDomain_964C05BBA88FBB5A904EE35B907E8400_terseLabel_en-US" xlink:label="lab_us-gaap_ClassOfStockDomain_964C05BBA88FBB5A904EE35B907E8400" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Class of Stock [Domain]</link:label>
    <link:label id="lab_us-gaap_ClassOfStockDomain_964C05BBA88FBB5A904EE35B907E8400_label_en-US" xlink:label="lab_us-gaap_ClassOfStockDomain_964C05BBA88FBB5A904EE35B907E8400" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Class of Stock [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_964C05BBA88FBB5A904EE35B907E8400" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ClassOfStockDomain_964C05BBA88FBB5A904EE35B907E8400" xlink:to="lab_us-gaap_ClassOfStockDomain_964C05BBA88FBB5A904EE35B907E8400" xlink:type="arc" />
    <link:label id="lab_us-gaap_CommonStockMember_21517C8CF86B734D2E1AE35B907E905D_terseLabel_en-US" xlink:label="lab_us-gaap_CommonStockMember_21517C8CF86B734D2E1AE35B907E905D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Common stock</link:label>
    <link:label id="lab_us-gaap_CommonStockMember_21517C8CF86B734D2E1AE35B907E905D_label_en-US" xlink:label="lab_us-gaap_CommonStockMember_21517C8CF86B734D2E1AE35B907E905D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Common Stock [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonStockMember" xlink:label="loc_us-gaap_CommonStockMember_21517C8CF86B734D2E1AE35B907E905D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommonStockMember_21517C8CF86B734D2E1AE35B907E905D" xlink:to="lab_us-gaap_CommonStockMember_21517C8CF86B734D2E1AE35B907E905D" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentRedemptionPeriodAxis_0317CFFAE64B9D7D8A8DE35B907E9CBC_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentRedemptionPeriodAxis_0317CFFAE64B9D7D8A8DE35B907E9CBC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument, Redemption, Period [Axis]</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentRedemptionPeriodAxis_0317CFFAE64B9D7D8A8DE35B907E9CBC_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentRedemptionPeriodAxis_0317CFFAE64B9D7D8A8DE35B907E9CBC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Redemption, Period [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentRedemptionPeriodAxis" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_0317CFFAE64B9D7D8A8DE35B907E9CBC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_0317CFFAE64B9D7D8A8DE35B907E9CBC" xlink:to="lab_us-gaap_DebtInstrumentRedemptionPeriodAxis_0317CFFAE64B9D7D8A8DE35B907E9CBC" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentRedemptionPeriodDomain_BE2069E7A9918B5815CFE35B907E7FAF_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentRedemptionPeriodDomain_BE2069E7A9918B5815CFE35B907E7FAF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt Instrument, Redemption, Period [Domain]</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentRedemptionPeriodDomain_BE2069E7A9918B5815CFE35B907E7FAF_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentRedemptionPeriodDomain_BE2069E7A9918B5815CFE35B907E7FAF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Redemption, Period [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentRedemptionPeriodDomain" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_BE2069E7A9918B5815CFE35B907E7FAF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_BE2069E7A9918B5815CFE35B907E7FAF" xlink:to="lab_us-gaap_DebtInstrumentRedemptionPeriodDomain_BE2069E7A9918B5815CFE35B907E7FAF" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentRedemptionPeriodOneMember_6A6DA6E43AE83A0D8BF5E35B907E824B_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentRedemptionPeriodOneMember_6A6DA6E43AE83A0D8BF5E35B907E824B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2017</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentRedemptionPeriodOneMember_6A6DA6E43AE83A0D8BF5E35B907E824B_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentRedemptionPeriodOneMember_6A6DA6E43AE83A0D8BF5E35B907E824B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Redemption, Period One [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentRedemptionPeriodOneMember" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodOneMember_6A6DA6E43AE83A0D8BF5E35B907E824B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodOneMember_6A6DA6E43AE83A0D8BF5E35B907E824B" xlink:to="lab_us-gaap_DebtInstrumentRedemptionPeriodOneMember_6A6DA6E43AE83A0D8BF5E35B907E824B" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentRedemptionPeriodTwoMember_F5950ECFA499032240F8E35B907FEE1D_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentRedemptionPeriodTwoMember_F5950ECFA499032240F8E35B907FEE1D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2019</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentRedemptionPeriodTwoMember_F5950ECFA499032240F8E35B907FEE1D_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentRedemptionPeriodTwoMember_F5950ECFA499032240F8E35B907FEE1D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Redemption, Period Two [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentRedemptionPeriodTwoMember" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodTwoMember_F5950ECFA499032240F8E35B907FEE1D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodTwoMember_F5950ECFA499032240F8E35B907FEE1D" xlink:to="lab_us-gaap_DebtInstrumentRedemptionPeriodTwoMember_F5950ECFA499032240F8E35B907FEE1D" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentRedemptionPeriodThreeMember_6B0D2E9020F83A09D70AE35B907FEF2B_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentRedemptionPeriodThreeMember_6B0D2E9020F83A09D70AE35B907FEF2B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2019</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentRedemptionPeriodThreeMember_6B0D2E9020F83A09D70AE35B907FEF2B_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentRedemptionPeriodThreeMember_6B0D2E9020F83A09D70AE35B907FEF2B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Redemption, Period Three [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentRedemptionPeriodThreeMember" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodThreeMember_6B0D2E9020F83A09D70AE35B907FEF2B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodThreeMember_6B0D2E9020F83A09D70AE35B907FEF2B" xlink:to="lab_us-gaap_DebtInstrumentRedemptionPeriodThreeMember_6B0D2E9020F83A09D70AE35B907FEF2B" xlink:type="arc" />
    <link:label id="lab_us-gaap_ClassOfWarrantOrRightLineItems_403C197C8B3BA14F4E01E35B907FC8F2_terseLabel_en-US" xlink:label="lab_us-gaap_ClassOfWarrantOrRightLineItems_403C197C8B3BA14F4E01E35B907FC8F2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Warrants</link:label>
    <link:label id="lab_us-gaap_ClassOfWarrantOrRightLineItems_403C197C8B3BA14F4E01E35B907FC8F2_label_en-US" xlink:label="lab_us-gaap_ClassOfWarrantOrRightLineItems_403C197C8B3BA14F4E01E35B907FC8F2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Class of Warrant or Right [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ClassOfWarrantOrRightLineItems" xlink:label="loc_us-gaap_ClassOfWarrantOrRightLineItems_403C197C8B3BA14F4E01E35B907FC8F2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_403C197C8B3BA14F4E01E35B907FC8F2" xlink:to="lab_us-gaap_ClassOfWarrantOrRightLineItems_403C197C8B3BA14F4E01E35B907FC8F2" xlink:type="arc" />
    <link:label id="lab_us-gaap_ClassOfWarrantOrRightOutstanding_EEA59BF204EF5D2EFE65E35B907FB8E1_terseLabel_en-US" xlink:label="lab_us-gaap_ClassOfWarrantOrRightOutstanding_EEA59BF204EF5D2EFE65E35B907FB8E1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Warrant shares (in shares)</link:label>
    <link:label id="lab_us-gaap_ClassOfWarrantOrRightOutstanding_EEA59BF204EF5D2EFE65E35B907FB8E1_label_en-US" xlink:label="lab_us-gaap_ClassOfWarrantOrRightOutstanding_EEA59BF204EF5D2EFE65E35B907FB8E1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Class of Warrant or Right, Outstanding</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ClassOfWarrantOrRightOutstanding" xlink:label="loc_us-gaap_ClassOfWarrantOrRightOutstanding_EEA59BF204EF5D2EFE65E35B907FB8E1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ClassOfWarrantOrRightOutstanding_EEA59BF204EF5D2EFE65E35B907FB8E1" xlink:to="lab_us-gaap_ClassOfWarrantOrRightOutstanding_EEA59BF204EF5D2EFE65E35B907FB8E1" xlink:type="arc" />
    <link:label id="lab_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_0E71A8747FB01FF7C3FBE35B907FB485_terseLabel_en-US" xlink:label="lab_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_0E71A8747FB01FF7C3FBE35B907FB485" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Exercise price (in dollars per share)</link:label>
    <link:label id="lab_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_0E71A8747FB01FF7C3FBE35B907FB485_label_en-US" xlink:label="lab_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_0E71A8747FB01FF7C3FBE35B907FB485" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Class of Warrant or Right, Exercise Price of Warrants or Rights</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1" xlink:label="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_0E71A8747FB01FF7C3FBE35B907FB485" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_0E71A8747FB01FF7C3FBE35B907FB485" xlink:to="lab_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_0E71A8747FB01FF7C3FBE35B907FB485" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_B6CA1DDB5C47DCE81FBE6D888E83AB96_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_B6CA1DDB5C47DCE81FBE6D888E83AB96" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of financial assets and liabilities that are required to be measured at fair value on a recurring basis</link:label>
    <link:label id="lab_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_B6CA1DDB5C47DCE81FBE6D888E83AB96_label_en-US" xlink:label="lab_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_B6CA1DDB5C47DCE81FBE6D888E83AB96" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_B6CA1DDB5C47DCE81FBE6D888E83AB96" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_B6CA1DDB5C47DCE81FBE6D888E83AB96" xlink:to="lab_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_B6CA1DDB5C47DCE81FBE6D888E83AB96" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock_8175DB69621EEC09C6B76D888E83E5B7_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock_8175DB69621EEC09C6B76D888E83E5B7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Summary of marketable securities accounted for as available-for-sale securities</link:label>
    <link:label id="lab_us-gaap_ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock_8175DB69621EEC09C6B76D888E83E5B7_label_en-US" xlink:label="lab_us-gaap_ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock_8175DB69621EEC09C6B76D888E83E5B7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Available-for-sale Securities Reconciliation [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock_8175DB69621EEC09C6B76D888E83E5B7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock_8175DB69621EEC09C6B76D888E83E5B7" xlink:to="lab_us-gaap_ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock_8175DB69621EEC09C6B76D888E83E5B7" xlink:type="arc" />
    <link:label id="lab_us-gaap_MarketableSecuritiesTextBlock_74B3D6186B97582E0ABB6D888E8382B9_terseLabel_en-US" xlink:label="lab_us-gaap_MarketableSecuritiesTextBlock_74B3D6186B97582E0ABB6D888E8382B9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of marketable securities on the balance sheet</link:label>
    <link:label id="lab_us-gaap_MarketableSecuritiesTextBlock_74B3D6186B97582E0ABB6D888E8382B9_label_en-US" xlink:label="lab_us-gaap_MarketableSecuritiesTextBlock_74B3D6186B97582E0ABB6D888E8382B9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Marketable Securities [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MarketableSecuritiesTextBlock" xlink:label="loc_us-gaap_MarketableSecuritiesTextBlock_74B3D6186B97582E0ABB6D888E8382B9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_MarketableSecuritiesTextBlock_74B3D6186B97582E0ABB6D888E8382B9" xlink:to="lab_us-gaap_MarketableSecuritiesTextBlock_74B3D6186B97582E0ABB6D888E8382B9" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock_10BAAC110B09D8E421516D888E83B447_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock_10BAAC110B09D8E421516D888E83B447" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Summary of changes in the fair value of the Company's Level 3 valuation for warrant liability and SARs liability</link:label>
    <link:label id="lab_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock_10BAAC110B09D8E421516D888E83B447_label_en-US" xlink:label="lab_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock_10BAAC110B09D8E421516D888E83B447" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock_10BAAC110B09D8E421516D888E83B447" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock_10BAAC110B09D8E421516D888E83B447" xlink:to="lab_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock_10BAAC110B09D8E421516D888E83B447" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncomeStatementAbstract_7628F9DB5458A80F31F51CF345FACF19_label_en-US" xlink:label="lab_us-gaap_IncomeStatementAbstract_7628F9DB5458A80F31F51CF345FACF19" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Statement [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeStatementAbstract" xlink:label="loc_us-gaap_IncomeStatementAbstract_7628F9DB5458A80F31F51CF345FACF19" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeStatementAbstract_7628F9DB5458A80F31F51CF345FACF19" xlink:to="lab_us-gaap_IncomeStatementAbstract_7628F9DB5458A80F31F51CF345FACF19" xlink:type="arc" />
    <link:label id="lab_us-gaap_SalesRevenueNetAbstract_A395B9FBEC9A08ADFD1D1CF345FA4712_terseLabel_en-US" xlink:label="lab_us-gaap_SalesRevenueNetAbstract_A395B9FBEC9A08ADFD1D1CF345FA4712" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revenues:</link:label>
    <link:label id="lab_us-gaap_SalesRevenueNetAbstract_A395B9FBEC9A08ADFD1D1CF345FA4712_label_en-US" xlink:label="lab_us-gaap_SalesRevenueNetAbstract_A395B9FBEC9A08ADFD1D1CF345FA4712" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revenue, Net [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SalesRevenueNetAbstract" xlink:label="loc_us-gaap_SalesRevenueNetAbstract_A395B9FBEC9A08ADFD1D1CF345FA4712" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SalesRevenueNetAbstract_A395B9FBEC9A08ADFD1D1CF345FA4712" xlink:to="lab_us-gaap_SalesRevenueNetAbstract_A395B9FBEC9A08ADFD1D1CF345FA4712" xlink:type="arc" />
    <link:label id="lab_ptct_NetProductSales_8C9B1860EDFB8281B3D21CF345FA825C_terseLabel_en-US" xlink:label="lab_ptct_NetProductSales_8C9B1860EDFB8281B3D21CF345FA825C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net product revenue</link:label>
    <link:label id="lab_ptct_NetProductSales_8C9B1860EDFB8281B3D21CF345FA825C_label_en-US" xlink:label="lab_ptct_NetProductSales_8C9B1860EDFB8281B3D21CF345FA825C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Product Sales</link:label>
    <link:label id="lab_ptct_NetProductSales_8C9B1860EDFB8281B3D21CF345FA825C_documentation_en-US" xlink:label="lab_ptct_NetProductSales_8C9B1860EDFB8281B3D21CF345FA825C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the amount of revenue earned from product sales during the reporting period.</link:label>
    <link:loc xlink:href="ptct-20160930.xsd#ptct_NetProductSales" xlink:label="loc_ptct_NetProductSales_8C9B1860EDFB8281B3D21CF345FA825C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_NetProductSales_8C9B1860EDFB8281B3D21CF345FA825C" xlink:to="lab_ptct_NetProductSales_8C9B1860EDFB8281B3D21CF345FA825C" xlink:type="arc" />
    <link:label id="lab_ptct_CollaborationAndGrantRevenue_76C2870090B18B255E651CF345FBA2B0_terseLabel_en-US" xlink:label="lab_ptct_CollaborationAndGrantRevenue_76C2870090B18B255E651CF345FBA2B0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Collaboration and grant revenue</link:label>
    <link:label id="lab_ptct_CollaborationAndGrantRevenue_76C2870090B18B255E651CF345FBA2B0_label_en-US" xlink:label="lab_ptct_CollaborationAndGrantRevenue_76C2870090B18B255E651CF345FBA2B0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Collaboration and grant revenue</link:label>
    <link:label id="lab_ptct_CollaborationAndGrantRevenue_76C2870090B18B255E651CF345FBA2B0_documentation_en-US" xlink:label="lab_ptct_CollaborationAndGrantRevenue_76C2870090B18B255E651CF345FBA2B0" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Amount of revenue earned from collaborative research and development and licensing agreements and non-repayable sum of money awarded to an entity to carry out a specific purpose as provided in grant agreements.</link:label>
    <link:loc xlink:href="ptct-20160930.xsd#ptct_CollaborationAndGrantRevenue" xlink:label="loc_ptct_CollaborationAndGrantRevenue_76C2870090B18B255E651CF345FBA2B0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_CollaborationAndGrantRevenue_76C2870090B18B255E651CF345FBA2B0" xlink:to="lab_ptct_CollaborationAndGrantRevenue_76C2870090B18B255E651CF345FBA2B0" xlink:type="arc" />
    <link:label id="lab_us-gaap_SalesRevenueNet_44FA02F2F5E03BF1F8A21CF345FBFB54_totalLabel_en-US" xlink:label="lab_us-gaap_SalesRevenueNet_44FA02F2F5E03BF1F8A21CF345FBFB54" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total revenues</link:label>
    <link:label id="lab_us-gaap_SalesRevenueNet_44FA02F2F5E03BF1F8A21CF345FBFB54_label_en-US" xlink:label="lab_us-gaap_SalesRevenueNet_44FA02F2F5E03BF1F8A21CF345FBFB54" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revenue, Net</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SalesRevenueNet" xlink:label="loc_us-gaap_SalesRevenueNet_44FA02F2F5E03BF1F8A21CF345FBFB54" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SalesRevenueNet_44FA02F2F5E03BF1F8A21CF345FBFB54" xlink:to="lab_us-gaap_SalesRevenueNet_44FA02F2F5E03BF1F8A21CF345FBFB54" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingExpensesAbstract_0AF5B1EC5075F98F707D1CF345FB9A56_terseLabel_en-US" xlink:label="lab_us-gaap_OperatingExpensesAbstract_0AF5B1EC5075F98F707D1CF345FB9A56" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Operating expenses:</link:label>
    <link:label id="lab_us-gaap_OperatingExpensesAbstract_0AF5B1EC5075F98F707D1CF345FB9A56_label_en-US" xlink:label="lab_us-gaap_OperatingExpensesAbstract_0AF5B1EC5075F98F707D1CF345FB9A56" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Expenses [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingExpensesAbstract" xlink:label="loc_us-gaap_OperatingExpensesAbstract_0AF5B1EC5075F98F707D1CF345FB9A56" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingExpensesAbstract_0AF5B1EC5075F98F707D1CF345FB9A56" xlink:to="lab_us-gaap_OperatingExpensesAbstract_0AF5B1EC5075F98F707D1CF345FB9A56" xlink:type="arc" />
    <link:label id="lab_us-gaap_ResearchAndDevelopmentExpense_CF5AAB51208940C8E3831CF345FB55BA_terseLabel_en-US" xlink:label="lab_us-gaap_ResearchAndDevelopmentExpense_CF5AAB51208940C8E3831CF345FB55BA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Research and development</link:label>
    <link:label id="lab_us-gaap_ResearchAndDevelopmentExpense_CF5AAB51208940C8E3831CF345FB55BA_label_en-US" xlink:label="lab_us-gaap_ResearchAndDevelopmentExpense_CF5AAB51208940C8E3831CF345FB55BA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Research and Development Expense</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ResearchAndDevelopmentExpense" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_CF5AAB51208940C8E3831CF345FB55BA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ResearchAndDevelopmentExpense_CF5AAB51208940C8E3831CF345FB55BA" xlink:to="lab_us-gaap_ResearchAndDevelopmentExpense_CF5AAB51208940C8E3831CF345FB55BA" xlink:type="arc" />
    <link:label id="lab_us-gaap_SellingGeneralAndAdministrativeExpense_48B38B7D62D4D8618FEB1CF345FB97F9_terseLabel_en-US" xlink:label="lab_us-gaap_SellingGeneralAndAdministrativeExpense_48B38B7D62D4D8618FEB1CF345FB97F9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Selling, general and administrative</link:label>
    <link:label id="lab_us-gaap_SellingGeneralAndAdministrativeExpense_48B38B7D62D4D8618FEB1CF345FB97F9_label_en-US" xlink:label="lab_us-gaap_SellingGeneralAndAdministrativeExpense_48B38B7D62D4D8618FEB1CF345FB97F9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Selling, General and Administrative Expense</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpense" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_48B38B7D62D4D8618FEB1CF345FB97F9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SellingGeneralAndAdministrativeExpense_48B38B7D62D4D8618FEB1CF345FB97F9" xlink:to="lab_us-gaap_SellingGeneralAndAdministrativeExpense_48B38B7D62D4D8618FEB1CF345FB97F9" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingExpenses_5117AF39227B297B73D21CF345FB7D24_totalLabel_en-US" xlink:label="lab_us-gaap_OperatingExpenses_5117AF39227B297B73D21CF345FB7D24" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total operating expenses</link:label>
    <link:label id="lab_us-gaap_OperatingExpenses_5117AF39227B297B73D21CF345FB7D24_label_en-US" xlink:label="lab_us-gaap_OperatingExpenses_5117AF39227B297B73D21CF345FB7D24" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Expenses</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingExpenses" xlink:label="loc_us-gaap_OperatingExpenses_5117AF39227B297B73D21CF345FB7D24" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingExpenses_5117AF39227B297B73D21CF345FB7D24" xlink:to="lab_us-gaap_OperatingExpenses_5117AF39227B297B73D21CF345FB7D24" xlink:type="arc" />
    <link:label id="lab_us-gaap_OperatingIncomeLoss_96F4A47608BD02B11C431CF345FB98B9_totalLabel_en-US" xlink:label="lab_us-gaap_OperatingIncomeLoss_96F4A47608BD02B11C431CF345FB98B9" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Loss from operations</link:label>
    <link:label id="lab_us-gaap_OperatingIncomeLoss_96F4A47608BD02B11C431CF345FB98B9_label_en-US" xlink:label="lab_us-gaap_OperatingIncomeLoss_96F4A47608BD02B11C431CF345FB98B9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Operating Income (Loss)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_96F4A47608BD02B11C431CF345FB98B9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OperatingIncomeLoss_96F4A47608BD02B11C431CF345FB98B9" xlink:to="lab_us-gaap_OperatingIncomeLoss_96F4A47608BD02B11C431CF345FB98B9" xlink:type="arc" />
    <link:label id="lab_us-gaap_InterestIncomeExpenseNonoperatingNet_C1CF9E0296A8291689A01CF345FB1002_terseLabel_en-US" xlink:label="lab_us-gaap_InterestIncomeExpenseNonoperatingNet_C1CF9E0296A8291689A01CF345FB1002" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest (expense) income, net</link:label>
    <link:label id="lab_us-gaap_InterestIncomeExpenseNonoperatingNet_C1CF9E0296A8291689A01CF345FB1002_label_en-US" xlink:label="lab_us-gaap_InterestIncomeExpenseNonoperatingNet_C1CF9E0296A8291689A01CF345FB1002" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Income (Expense), Nonoperating, Net</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InterestIncomeExpenseNonoperatingNet" xlink:label="loc_us-gaap_InterestIncomeExpenseNonoperatingNet_C1CF9E0296A8291689A01CF345FB1002" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InterestIncomeExpenseNonoperatingNet_C1CF9E0296A8291689A01CF345FB1002" xlink:to="lab_us-gaap_InterestIncomeExpenseNonoperatingNet_C1CF9E0296A8291689A01CF345FB1002" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherNonoperatingIncomeExpense_AC3445734903F2783C111CF345FBF43F_verboseLabel_en-US" xlink:label="lab_us-gaap_OtherNonoperatingIncomeExpense_AC3445734903F2783C111CF345FBF43F" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Other expense, net</link:label>
    <link:label id="lab_us-gaap_OtherNonoperatingIncomeExpense_AC3445734903F2783C111CF345FBF43F_label_en-US" xlink:label="lab_us-gaap_OtherNonoperatingIncomeExpense_AC3445734903F2783C111CF345FBF43F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Nonoperating Income (Expense)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_AC3445734903F2783C111CF345FBF43F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherNonoperatingIncomeExpense_AC3445734903F2783C111CF345FBF43F" xlink:to="lab_us-gaap_OtherNonoperatingIncomeExpense_AC3445734903F2783C111CF345FBF43F" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_4CB445E69F3E673B84231CF345FB0DCE_totalLabel_en-US" xlink:label="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_4CB445E69F3E673B84231CF345FB0DCE" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Loss before income tax expense</link:label>
    <link:label id="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_4CB445E69F3E673B84231CF345FB0DCE_label_en-US" xlink:label="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_4CB445E69F3E673B84231CF345FB0DCE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_4CB445E69F3E673B84231CF345FB0DCE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_4CB445E69F3E673B84231CF345FB0DCE" xlink:to="lab_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_4CB445E69F3E673B84231CF345FB0DCE" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncomeTaxExpenseBenefit_89BE2F01A5BBE1B426151CF345FB483B_negatedLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxExpenseBenefit_89BE2F01A5BBE1B426151CF345FB483B" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Income tax expense</link:label>
    <link:label id="lab_us-gaap_IncomeTaxExpenseBenefit_89BE2F01A5BBE1B426151CF345FB483B_label_en-US" xlink:label="lab_us-gaap_IncomeTaxExpenseBenefit_89BE2F01A5BBE1B426151CF345FB483B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Tax Expense (Benefit)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_89BE2F01A5BBE1B426151CF345FB483B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_89BE2F01A5BBE1B426151CF345FB483B" xlink:to="lab_us-gaap_IncomeTaxExpenseBenefit_89BE2F01A5BBE1B426151CF345FB483B" xlink:type="arc" />
    <link:label id="lab_us-gaap_ProfitLoss_33D729917A648C9CED191CF345FBD175_totalLabel_en-US" xlink:label="lab_us-gaap_ProfitLoss_33D729917A648C9CED191CF345FBD175" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net loss attributable to common stockholders</link:label>
    <link:label id="lab_us-gaap_ProfitLoss_33D729917A648C9CED191CF345FBD175_label_en-US" xlink:label="lab_us-gaap_ProfitLoss_33D729917A648C9CED191CF345FBD175" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Income (Loss), Including Portion Attributable to Noncontrolling Interest</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_33D729917A648C9CED191CF345FBD175" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProfitLoss_33D729917A648C9CED191CF345FBD175" xlink:to="lab_us-gaap_ProfitLoss_33D729917A648C9CED191CF345FBD175" xlink:type="arc" />
    <link:label id="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_341A3CDA2271D8F725491CF345FC0F3E_terseLabel_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_341A3CDA2271D8F725491CF345FC0F3E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Weighted-average shares outstanding:</link:label>
    <link:label id="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_341A3CDA2271D8F725491CF345FC0F3E_label_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_341A3CDA2271D8F725491CF345FC0F3E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Weighted Average Number of Shares Outstanding, Diluted [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_341A3CDA2271D8F725491CF345FC0F3E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_341A3CDA2271D8F725491CF345FC0F3E" xlink:to="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_341A3CDA2271D8F725491CF345FC0F3E" xlink:type="arc" />
    <link:label id="lab_us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted_E8819CEC95B8E4809C451CF345FC5C68_verboseLabel_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted_E8819CEC95B8E4809C451CF345FC5C68" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Basic and diluted (in shares)</link:label>
    <link:label id="lab_us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted_E8819CEC95B8E4809C451CF345FC5C68_label_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted_E8819CEC95B8E4809C451CF345FC5C68" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Weighted Average Number of Shares Outstanding, Basic and Diluted</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted" xlink:label="loc_us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted_E8819CEC95B8E4809C451CF345FC5C68" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted_E8819CEC95B8E4809C451CF345FC5C68" xlink:to="lab_us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted_E8819CEC95B8E4809C451CF345FC5C68" xlink:type="arc" />
    <link:label id="lab_us-gaap_EarningsPerShareAbstract_1250E6D287CFFAFE714E1CF345FC6765_terseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareAbstract_1250E6D287CFFAFE714E1CF345FC6765" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net loss per share-basic and diluted (in dollars per share)</link:label>
    <link:label id="lab_us-gaap_EarningsPerShareAbstract_1250E6D287CFFAFE714E1CF345FC6765_label_en-US" xlink:label="lab_us-gaap_EarningsPerShareAbstract_1250E6D287CFFAFE714E1CF345FC6765" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Earnings Per Share [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EarningsPerShareAbstract" xlink:label="loc_us-gaap_EarningsPerShareAbstract_1250E6D287CFFAFE714E1CF345FC6765" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EarningsPerShareAbstract_1250E6D287CFFAFE714E1CF345FC6765" xlink:to="lab_us-gaap_EarningsPerShareAbstract_1250E6D287CFFAFE714E1CF345FC6765" xlink:type="arc" />
    <link:label id="lab_us-gaap_EarningsPerShareBasicAndDiluted_23FC8C21FC1AA9305CC51CF345FC3626_verboseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareBasicAndDiluted_23FC8C21FC1AA9305CC51CF345FC3626" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Net loss per share&#8212;basic and diluted (in dollars per share)</link:label>
    <link:label id="lab_us-gaap_EarningsPerShareBasicAndDiluted_23FC8C21FC1AA9305CC51CF345FC3626_label_en-US" xlink:label="lab_us-gaap_EarningsPerShareBasicAndDiluted_23FC8C21FC1AA9305CC51CF345FC3626" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Earnings Per Share, Basic and Diluted</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EarningsPerShareBasicAndDiluted" xlink:label="loc_us-gaap_EarningsPerShareBasicAndDiluted_23FC8C21FC1AA9305CC51CF345FC3626" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EarningsPerShareBasicAndDiluted_23FC8C21FC1AA9305CC51CF345FC3626" xlink:to="lab_us-gaap_EarningsPerShareBasicAndDiluted_23FC8C21FC1AA9305CC51CF345FC3626" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfRestructuringAndRelatedCostsTextBlock_62718181A1FD66E742162261B58F0CF6_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfRestructuringAndRelatedCostsTextBlock_62718181A1FD66E742162261B58F0CF6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of restructuring charges related to work-force reduction</link:label>
    <link:label id="lab_us-gaap_ScheduleOfRestructuringAndRelatedCostsTextBlock_62718181A1FD66E742162261B58F0CF6_label_en-US" xlink:label="lab_us-gaap_ScheduleOfRestructuringAndRelatedCostsTextBlock_62718181A1FD66E742162261B58F0CF6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Restructuring and Related Costs [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTextBlock" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTextBlock_62718181A1FD66E742162261B58F0CF6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTextBlock_62718181A1FD66E742162261B58F0CF6" xlink:to="lab_us-gaap_ScheduleOfRestructuringAndRelatedCostsTextBlock_62718181A1FD66E742162261B58F0CF6" xlink:type="arc" />
    <link:label id="lab_us-gaap_ComprehensiveIncomeNetOfTaxAbstract_A30824F9B2733D41EE6D1CF345B2561F_label_en-US" xlink:label="lab_us-gaap_ComprehensiveIncomeNetOfTaxAbstract_A30824F9B2733D41EE6D1CF345B2561F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxAbstract" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxAbstract_A30824F9B2733D41EE6D1CF345B2561F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxAbstract_A30824F9B2733D41EE6D1CF345B2561F" xlink:to="lab_us-gaap_ComprehensiveIncomeNetOfTaxAbstract_A30824F9B2733D41EE6D1CF345B2561F" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock_38CF8F770C97FFC1FF2F1CF345B36657_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock_38CF8F770C97FFC1FF2F1CF345B36657" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Summary of other comprehensive income (loss) and the changes in accumulated other comprehensive items</link:label>
    <link:label id="lab_us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock_38CF8F770C97FFC1FF2F1CF345B36657_label_en-US" xlink:label="lab_us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock_38CF8F770C97FFC1FF2F1CF345B36657" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock_38CF8F770C97FFC1FF2F1CF345B36657" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock_38CF8F770C97FFC1FF2F1CF345B36657" xlink:to="lab_us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock_38CF8F770C97FFC1FF2F1CF345B36657" xlink:type="arc" />
    <link:label id="lab_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_28BC84C4F6F0500BBEB76D888E74A4D7_label_en-US" xlink:label="lab_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_28BC84C4F6F0500BBEB76D888E74A4D7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Commitments and Contingencies Disclosure [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommitmentsAndContingenciesDisclosureAbstract" xlink:label="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_28BC84C4F6F0500BBEB76D888E74A4D7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_28BC84C4F6F0500BBEB76D888E74A4D7" xlink:to="lab_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_28BC84C4F6F0500BBEB76D888E74A4D7" xlink:type="arc" />
    <link:label id="lab_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_1829840FBE197BD3780D6D888E742127_terseLabel_en-US" xlink:label="lab_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_1829840FBE197BD3780D6D888E742127" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Commitments and contingencies</link:label>
    <link:label id="lab_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_1829840FBE197BD3780D6D888E742127_label_en-US" xlink:label="lab_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_1829840FBE197BD3780D6D888E742127" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Commitments and Contingencies Disclosure [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommitmentsAndContingenciesDisclosureTextBlock" xlink:label="loc_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_1829840FBE197BD3780D6D888E742127" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_1829840FBE197BD3780D6D888E742127" xlink:to="lab_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_1829840FBE197BD3780D6D888E742127" xlink:type="arc" />
    <link:label id="lab_ptct_DebtInstrumentConversionPeriodOnOrAfterAugust202018Member_A5E55E087367BA8AC04B1CF3451F9203_terseLabel_en-US" xlink:label="lab_ptct_DebtInstrumentConversionPeriodOnOrAfterAugust202018Member_A5E55E087367BA8AC04B1CF3451F9203" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Redemption on or after August 20, 2018</link:label>
    <link:label id="lab_ptct_DebtInstrumentConversionPeriodOnOrAfterAugust202018Member_A5E55E087367BA8AC04B1CF3451F9203_label_en-US" xlink:label="lab_ptct_DebtInstrumentConversionPeriodOnOrAfterAugust202018Member_A5E55E087367BA8AC04B1CF3451F9203" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument Conversion Period On Or After August202018 [Member]</link:label>
    <link:label id="lab_ptct_DebtInstrumentConversionPeriodOnOrAfterAugust202018Member_A5E55E087367BA8AC04B1CF3451F9203_documentation_en-US" xlink:label="lab_ptct_DebtInstrumentConversionPeriodOnOrAfterAugust202018Member_A5E55E087367BA8AC04B1CF3451F9203" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the debt instrument redemption period on or after August 20, 2018.</link:label>
    <link:loc xlink:href="ptct-20160930.xsd#ptct_DebtInstrumentConversionPeriodOnOrAfterAugust202018Member" xlink:label="loc_ptct_DebtInstrumentConversionPeriodOnOrAfterAugust202018Member_A5E55E087367BA8AC04B1CF3451F9203" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_DebtInstrumentConversionPeriodOnOrAfterAugust202018Member_A5E55E087367BA8AC04B1CF3451F9203" xlink:to="lab_ptct_DebtInstrumentConversionPeriodOnOrAfterAugust202018Member_A5E55E087367BA8AC04B1CF3451F9203" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentFaceAmount_8FB5C42E292464765D671CF3451F077B_verboseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentFaceAmount_8FB5C42E292464765D671CF3451F077B" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Debt principal amount</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentFaceAmount_8FB5C42E292464765D671CF3451F077B_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentFaceAmount_8FB5C42E292464765D671CF3451F077B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Face Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentFaceAmount" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_8FB5C42E292464765D671CF3451F077B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentFaceAmount_8FB5C42E292464765D671CF3451F077B" xlink:to="lab_us-gaap_DebtInstrumentFaceAmount_8FB5C42E292464765D671CF3451F077B" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_F99201D330CEE9E536681CF345204703_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_F99201D330CEE9E536681CF345204703" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Interest rate</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_F99201D330CEE9E536681CF345204703_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_F99201D330CEE9E536681CF345204703" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Interest Rate, Stated Percentage</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_F99201D330CEE9E536681CF345204703" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_F99201D330CEE9E536681CF345204703" xlink:to="lab_us-gaap_DebtInstrumentInterestRateStatedPercentage_F99201D330CEE9E536681CF345204703" xlink:type="arc" />
    <link:label id="lab_us-gaap_ProceedsFromDebtNetOfIssuanceCosts_17120691584B171741671CF34520AB97_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromDebtNetOfIssuanceCosts_17120691584B171741671CF34520AB97" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net proceeds from issuance of convertible notes</link:label>
    <link:label id="lab_us-gaap_ProceedsFromDebtNetOfIssuanceCosts_17120691584B171741671CF34520AB97_label_en-US" xlink:label="lab_us-gaap_ProceedsFromDebtNetOfIssuanceCosts_17120691584B171741671CF34520AB97" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from Debt, Net of Issuance Costs</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProceedsFromDebtNetOfIssuanceCosts" xlink:label="loc_us-gaap_ProceedsFromDebtNetOfIssuanceCosts_17120691584B171741671CF34520AB97" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromDebtNetOfIssuanceCosts_17120691584B171741671CF34520AB97" xlink:to="lab_us-gaap_ProceedsFromDebtNetOfIssuanceCosts_17120691584B171741671CF34520AB97" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentConvertibleThresholdTradingDays_08ABAF7E60F0A58931DA1CF345200284_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentConvertibleThresholdTradingDays_08ABAF7E60F0A58931DA1CF345200284" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Trading days, number</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentConvertibleThresholdTradingDays_08ABAF7E60F0A58931DA1CF345200284_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentConvertibleThresholdTradingDays_08ABAF7E60F0A58931DA1CF345200284" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Convertible, Threshold Trading Days</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentConvertibleThresholdTradingDays" xlink:label="loc_us-gaap_DebtInstrumentConvertibleThresholdTradingDays_08ABAF7E60F0A58931DA1CF345200284" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentConvertibleThresholdTradingDays_08ABAF7E60F0A58931DA1CF345200284" xlink:to="lab_us-gaap_DebtInstrumentConvertibleThresholdTradingDays_08ABAF7E60F0A58931DA1CF345200284" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays_073C234C46BBB031EC8D1CF345208C2D_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays_073C234C46BBB031EC8D1CF345208C2D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Consecutive trading days, period</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays_073C234C46BBB031EC8D1CF345208C2D_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays_073C234C46BBB031EC8D1CF345208C2D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Convertible, Threshold Consecutive Trading Days</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays" xlink:label="loc_us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays_073C234C46BBB031EC8D1CF345208C2D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays_073C234C46BBB031EC8D1CF345208C2D" xlink:to="lab_us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays_073C234C46BBB031EC8D1CF345208C2D" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger_83A9436F4CFC42119C8B1CF34520C412_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger_83A9436F4CFC42119C8B1CF34520C412" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Stock price trigger (as a percent)</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger_83A9436F4CFC42119C8B1CF34520C412_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger_83A9436F4CFC42119C8B1CF34520C412" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger" xlink:label="loc_us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger_83A9436F4CFC42119C8B1CF34520C412" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger_83A9436F4CFC42119C8B1CF34520C412" xlink:to="lab_us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger_83A9436F4CFC42119C8B1CF34520C412" xlink:type="arc" />
    <link:label id="lab_ptct_DebtInstrumentConvertibleThresholdBusinessDays_CF9FEB414CDA657373121CF345206DD7_terseLabel_en-US" xlink:label="lab_ptct_DebtInstrumentConvertibleThresholdBusinessDays_CF9FEB414CDA657373121CF345206DD7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Business days, period</link:label>
    <link:label id="lab_ptct_DebtInstrumentConvertibleThresholdBusinessDays_CF9FEB414CDA657373121CF345206DD7_label_en-US" xlink:label="lab_ptct_DebtInstrumentConvertibleThresholdBusinessDays_CF9FEB414CDA657373121CF345206DD7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument Convertible Threshold Business Days</link:label>
    <link:label id="lab_ptct_DebtInstrumentConvertibleThresholdBusinessDays_CF9FEB414CDA657373121CF345206DD7_documentation_en-US" xlink:label="lab_ptct_DebtInstrumentConvertibleThresholdBusinessDays_CF9FEB414CDA657373121CF345206DD7" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Threshold period of specified business days within which the maximum product of the closing sale price of shares of the entity's common stock and the applicable conversion rate for such trading day triggers the conversion feature.</link:label>
    <link:loc xlink:href="ptct-20160930.xsd#ptct_DebtInstrumentConvertibleThresholdBusinessDays" xlink:label="loc_ptct_DebtInstrumentConvertibleThresholdBusinessDays_CF9FEB414CDA657373121CF345206DD7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_DebtInstrumentConvertibleThresholdBusinessDays_CF9FEB414CDA657373121CF345206DD7" xlink:to="lab_ptct_DebtInstrumentConvertibleThresholdBusinessDays_CF9FEB414CDA657373121CF345206DD7" xlink:type="arc" />
    <link:label id="lab_ptct_DebtInstrumentConvertibleThresholdConsecutiveTradingDayPeriod_D76606B575FEB1CB99D41CF34520EA8A_terseLabel_en-US" xlink:label="lab_ptct_DebtInstrumentConvertibleThresholdConsecutiveTradingDayPeriod_D76606B575FEB1CB99D41CF34520EA8A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Consecutive trading-day period</link:label>
    <link:label id="lab_ptct_DebtInstrumentConvertibleThresholdConsecutiveTradingDayPeriod_D76606B575FEB1CB99D41CF34520EA8A_label_en-US" xlink:label="lab_ptct_DebtInstrumentConvertibleThresholdConsecutiveTradingDayPeriod_D76606B575FEB1CB99D41CF34520EA8A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument Convertible Threshold Consecutive Trading Day Period</link:label>
    <link:label id="lab_ptct_DebtInstrumentConvertibleThresholdConsecutiveTradingDayPeriod_D76606B575FEB1CB99D41CF34520EA8A_documentation_en-US" xlink:label="lab_ptct_DebtInstrumentConvertibleThresholdConsecutiveTradingDayPeriod_D76606B575FEB1CB99D41CF34520EA8A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Threshold period of specified consecutive trading days within which the maximum product of the closing sale price of shares of the entity's common stock and the applicable conversion rate for such trading day triggers the conversion feature.</link:label>
    <link:loc xlink:href="ptct-20160930.xsd#ptct_DebtInstrumentConvertibleThresholdConsecutiveTradingDayPeriod" xlink:label="loc_ptct_DebtInstrumentConvertibleThresholdConsecutiveTradingDayPeriod_D76606B575FEB1CB99D41CF34520EA8A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_DebtInstrumentConvertibleThresholdConsecutiveTradingDayPeriod_D76606B575FEB1CB99D41CF34520EA8A" xlink:to="lab_ptct_DebtInstrumentConvertibleThresholdConsecutiveTradingDayPeriod_D76606B575FEB1CB99D41CF34520EA8A" xlink:type="arc" />
    <link:label id="lab_ptct_DebtInstrumentPrincipalAmountDenominationForConversionIntoCommonStock_39D5B3D1F62F932319D01CF345209F4D_terseLabel_en-US" xlink:label="lab_ptct_DebtInstrumentPrincipalAmountDenominationForConversionIntoCommonStock_39D5B3D1F62F932319D01CF345209F4D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Common stock per principal amount</link:label>
    <link:label id="lab_ptct_DebtInstrumentPrincipalAmountDenominationForConversionIntoCommonStock_39D5B3D1F62F932319D01CF345209F4D_label_en-US" xlink:label="lab_ptct_DebtInstrumentPrincipalAmountDenominationForConversionIntoCommonStock_39D5B3D1F62F932319D01CF345209F4D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument Principal Amount Denomination For Conversion Into Common Stock</link:label>
    <link:label id="lab_ptct_DebtInstrumentPrincipalAmountDenominationForConversionIntoCommonStock_39D5B3D1F62F932319D01CF345209F4D_documentation_en-US" xlink:label="lab_ptct_DebtInstrumentPrincipalAmountDenominationForConversionIntoCommonStock_39D5B3D1F62F932319D01CF345209F4D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the denomination of the principal amount of debt that is used in conversion calculations.</link:label>
    <link:loc xlink:href="ptct-20160930.xsd#ptct_DebtInstrumentPrincipalAmountDenominationForConversionIntoCommonStock" xlink:label="loc_ptct_DebtInstrumentPrincipalAmountDenominationForConversionIntoCommonStock_39D5B3D1F62F932319D01CF345209F4D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_DebtInstrumentPrincipalAmountDenominationForConversionIntoCommonStock_39D5B3D1F62F932319D01CF345209F4D" xlink:to="lab_ptct_DebtInstrumentPrincipalAmountDenominationForConversionIntoCommonStock_39D5B3D1F62F932319D01CF345209F4D" xlink:type="arc" />
    <link:label id="lab_ptct_DebtInstrumentConvertibleThresholdSalePriceOfCommonStockConversionRateProductPercentageMaximum_2846E0B86B0D77840DA61CF345209E24_terseLabel_en-US" xlink:label="lab_ptct_DebtInstrumentConvertibleThresholdSalePriceOfCommonStockConversionRateProductPercentageMaximum_2846E0B86B0D77840DA61CF345209E24" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Maximum product of the closing sale price of shares of the Company's common stock and the applicable conversion rate for such trading day (as a percent)</link:label>
    <link:label id="lab_ptct_DebtInstrumentConvertibleThresholdSalePriceOfCommonStockConversionRateProductPercentageMaximum_2846E0B86B0D77840DA61CF345209E24_label_en-US" xlink:label="lab_ptct_DebtInstrumentConvertibleThresholdSalePriceOfCommonStockConversionRateProductPercentageMaximum_2846E0B86B0D77840DA61CF345209E24" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument Convertible Threshold Sale Price Of Common Stock Conversion Rate Product Percentage Maximum</link:label>
    <link:label id="lab_ptct_DebtInstrumentConvertibleThresholdSalePriceOfCommonStockConversionRateProductPercentageMaximum_2846E0B86B0D77840DA61CF345209E24_documentation_en-US" xlink:label="lab_ptct_DebtInstrumentConvertibleThresholdSalePriceOfCommonStockConversionRateProductPercentageMaximum_2846E0B86B0D77840DA61CF345209E24" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the maximum product of the closing sale price of shares of the entity's common stock and the applicable conversion rate for such trading day.</link:label>
    <link:loc xlink:href="ptct-20160930.xsd#ptct_DebtInstrumentConvertibleThresholdSalePriceOfCommonStockConversionRateProductPercentageMaximum" xlink:label="loc_ptct_DebtInstrumentConvertibleThresholdSalePriceOfCommonStockConversionRateProductPercentageMaximum_2846E0B86B0D77840DA61CF345209E24" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_DebtInstrumentConvertibleThresholdSalePriceOfCommonStockConversionRateProductPercentageMaximum_2846E0B86B0D77840DA61CF345209E24" xlink:to="lab_ptct_DebtInstrumentConvertibleThresholdSalePriceOfCommonStockConversionRateProductPercentageMaximum_2846E0B86B0D77840DA61CF345209E24" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentConvertibleConversionRatio1_FD46AD23CF93C2AE4B6A1CF345205785_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentConvertibleConversionRatio1_FD46AD23CF93C2AE4B6A1CF345205785" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Conversion ratio</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentConvertibleConversionRatio1_FD46AD23CF93C2AE4B6A1CF345205785_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentConvertibleConversionRatio1_FD46AD23CF93C2AE4B6A1CF345205785" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Convertible, Conversion Ratio</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentConvertibleConversionRatio1" xlink:label="loc_us-gaap_DebtInstrumentConvertibleConversionRatio1_FD46AD23CF93C2AE4B6A1CF345205785" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentConvertibleConversionRatio1_FD46AD23CF93C2AE4B6A1CF345205785" xlink:to="lab_us-gaap_DebtInstrumentConvertibleConversionRatio1_FD46AD23CF93C2AE4B6A1CF345205785" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentConvertibleConversionPrice1_F7D9A5497A6294C0067C1CF345202AD2_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentConvertibleConversionPrice1_F7D9A5497A6294C0067C1CF345202AD2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Conversion price per share</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentConvertibleConversionPrice1_F7D9A5497A6294C0067C1CF345202AD2_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentConvertibleConversionPrice1_F7D9A5497A6294C0067C1CF345202AD2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Convertible, Conversion Price</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentConvertibleConversionPrice1" xlink:label="loc_us-gaap_DebtInstrumentConvertibleConversionPrice1_F7D9A5497A6294C0067C1CF345202AD2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentConvertibleConversionPrice1_F7D9A5497A6294C0067C1CF345202AD2" xlink:to="lab_us-gaap_DebtInstrumentConvertibleConversionPrice1_F7D9A5497A6294C0067C1CF345202AD2" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentRedemptionPricePercentage_C3ABF8D5BF91EACEB2E81CF34520A6ED_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentRedemptionPricePercentage_C3ABF8D5BF91EACEB2E81CF34520A6ED" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Redemption price (as a percent)</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentRedemptionPricePercentage_C3ABF8D5BF91EACEB2E81CF34520A6ED_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentRedemptionPricePercentage_C3ABF8D5BF91EACEB2E81CF34520A6ED" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Redemption Price, Percentage</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentRedemptionPricePercentage" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_C3ABF8D5BF91EACEB2E81CF34520A6ED" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_C3ABF8D5BF91EACEB2E81CF34520A6ED" xlink:to="lab_us-gaap_DebtInstrumentRedemptionPricePercentage_C3ABF8D5BF91EACEB2E81CF34520A6ED" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentCumulativeSinkingFundPayments_6D7ECC121066B9F79C611CF34520B8FC_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentCumulativeSinkingFundPayments_6D7ECC121066B9F79C611CF34520B8FC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Sinking fund</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentCumulativeSinkingFundPayments_6D7ECC121066B9F79C611CF34520B8FC_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentCumulativeSinkingFundPayments_6D7ECC121066B9F79C611CF34520B8FC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Cumulative Sinking Fund Payments</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentCumulativeSinkingFundPayments" xlink:label="loc_us-gaap_DebtInstrumentCumulativeSinkingFundPayments_6D7ECC121066B9F79C611CF34520B8FC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentCumulativeSinkingFundPayments_6D7ECC121066B9F79C611CF34520B8FC" xlink:to="lab_us-gaap_DebtInstrumentCumulativeSinkingFundPayments_6D7ECC121066B9F79C611CF34520B8FC" xlink:type="arc" />
    <link:label id="lab_ptct_ConvertibleInstrumentsPrincipalAndUnpaidInterestPayableUponEventsOfDefault_AEA6E2692726490EA2981CF34520C422_terseLabel_en-US" xlink:label="lab_ptct_ConvertibleInstrumentsPrincipalAndUnpaidInterestPayableUponEventsOfDefault_AEA6E2692726490EA2981CF34520C422" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Convertible instruments principal and unpaid interest payable upon events of default</link:label>
    <link:label id="lab_ptct_ConvertibleInstrumentsPrincipalAndUnpaidInterestPayableUponEventsOfDefault_AEA6E2692726490EA2981CF34520C422_label_en-US" xlink:label="lab_ptct_ConvertibleInstrumentsPrincipalAndUnpaidInterestPayableUponEventsOfDefault_AEA6E2692726490EA2981CF34520C422" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Convertible Instruments Principal And Unpaid Interest Payable Upon Events Of Default</link:label>
    <link:label id="lab_ptct_ConvertibleInstrumentsPrincipalAndUnpaidInterestPayableUponEventsOfDefault_AEA6E2692726490EA2981CF34520C422_documentation_en-US" xlink:label="lab_ptct_ConvertibleInstrumentsPrincipalAndUnpaidInterestPayableUponEventsOfDefault_AEA6E2692726490EA2981CF34520C422" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the debt instrument principal and unpaid interest payable upon events of default.</link:label>
    <link:loc xlink:href="ptct-20160930.xsd#ptct_ConvertibleInstrumentsPrincipalAndUnpaidInterestPayableUponEventsOfDefault" xlink:label="loc_ptct_ConvertibleInstrumentsPrincipalAndUnpaidInterestPayableUponEventsOfDefault_AEA6E2692726490EA2981CF34520C422" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_ConvertibleInstrumentsPrincipalAndUnpaidInterestPayableUponEventsOfDefault_AEA6E2692726490EA2981CF34520C422" xlink:to="lab_ptct_ConvertibleInstrumentsPrincipalAndUnpaidInterestPayableUponEventsOfDefault_AEA6E2692726490EA2981CF34520C422" xlink:type="arc" />
    <link:label id="lab_ptct_MinimumPercentageOfDebtPrincipalAmountByInstrumentHolders_AA8953DF4631C8551FFD1CF3452007B9_terseLabel_en-US" xlink:label="lab_ptct_MinimumPercentageOfDebtPrincipalAmountByInstrumentHolders_AA8953DF4631C8551FFD1CF3452007B9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Minimum percentage of principal held by convertible debt instrument holders required to issue notice for declaration of principal and unpaid interest payable upon events of default (as a percent)</link:label>
    <link:label id="lab_ptct_MinimumPercentageOfDebtPrincipalAmountByInstrumentHolders_AA8953DF4631C8551FFD1CF3452007B9_label_en-US" xlink:label="lab_ptct_MinimumPercentageOfDebtPrincipalAmountByInstrumentHolders_AA8953DF4631C8551FFD1CF3452007B9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Minimum Percentage Of Debt Principal Amount By Instrument Holders</link:label>
    <link:label id="lab_ptct_MinimumPercentageOfDebtPrincipalAmountByInstrumentHolders_AA8953DF4631C8551FFD1CF3452007B9_documentation_en-US" xlink:label="lab_ptct_MinimumPercentageOfDebtPrincipalAmountByInstrumentHolders_AA8953DF4631C8551FFD1CF3452007B9" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the minimum percentage of debt principal amount by instrument holders.</link:label>
    <link:loc xlink:href="ptct-20160930.xsd#ptct_MinimumPercentageOfDebtPrincipalAmountByInstrumentHolders" xlink:label="loc_ptct_MinimumPercentageOfDebtPrincipalAmountByInstrumentHolders_AA8953DF4631C8551FFD1CF3452007B9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_MinimumPercentageOfDebtPrincipalAmountByInstrumentHolders_AA8953DF4631C8551FFD1CF3452007B9" xlink:to="lab_ptct_MinimumPercentageOfDebtPrincipalAmountByInstrumentHolders_AA8953DF4631C8551FFD1CF3452007B9" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentTerm_A4D1BAC1FFDA40A1AD811CF345203684_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentTerm_A4D1BAC1FFDA40A1AD811CF345203684" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Term of the convertible notes</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentTerm_A4D1BAC1FFDA40A1AD811CF345203684_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentTerm_A4D1BAC1FFDA40A1AD811CF345203684" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Term</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentTerm" xlink:label="loc_us-gaap_DebtInstrumentTerm_A4D1BAC1FFDA40A1AD811CF345203684" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentTerm_A4D1BAC1FFDA40A1AD811CF345203684" xlink:to="lab_us-gaap_DebtInstrumentTerm_A4D1BAC1FFDA40A1AD811CF345203684" xlink:type="arc" />
    <link:label id="lab_ptct_NetDeferredTaxLiabilitiesConvertibleDebtInstruments_D15D87D595D1EACACDBD1CF345210777_terseLabel_en-US" xlink:label="lab_ptct_NetDeferredTaxLiabilitiesConvertibleDebtInstruments_D15D87D595D1EACACDBD1CF345210777" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net deferred tax liability in connection with convertible notes</link:label>
    <link:label id="lab_ptct_NetDeferredTaxLiabilitiesConvertibleDebtInstruments_D15D87D595D1EACACDBD1CF345210777_label_en-US" xlink:label="lab_ptct_NetDeferredTaxLiabilitiesConvertibleDebtInstruments_D15D87D595D1EACACDBD1CF345210777" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Deferred Tax Liabilities Convertible Debt Instruments</link:label>
    <link:label id="lab_ptct_NetDeferredTaxLiabilitiesConvertibleDebtInstruments_D15D87D595D1EACACDBD1CF345210777_documentation_en-US" xlink:label="lab_ptct_NetDeferredTaxLiabilitiesConvertibleDebtInstruments_D15D87D595D1EACACDBD1CF345210777" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Amount of net deferred tax liability attributable to taxable temporary differences from issuance of convertible debt instruments.</link:label>
    <link:loc xlink:href="ptct-20160930.xsd#ptct_NetDeferredTaxLiabilitiesConvertibleDebtInstruments" xlink:label="loc_ptct_NetDeferredTaxLiabilitiesConvertibleDebtInstruments_D15D87D595D1EACACDBD1CF345210777" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_NetDeferredTaxLiabilitiesConvertibleDebtInstruments_D15D87D595D1EACACDBD1CF345210777" xlink:to="lab_ptct_NetDeferredTaxLiabilitiesConvertibleDebtInstruments_D15D87D595D1EACACDBD1CF345210777" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentFairValue_F94B47DC61146A5098151CF345210C14_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentFairValue_F94B47DC61146A5098151CF345210C14" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair value of convertible notes</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentFairValue_F94B47DC61146A5098151CF345210C14_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentFairValue_F94B47DC61146A5098151CF345210C14" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Fair Value Disclosure</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentFairValue" xlink:label="loc_us-gaap_DebtInstrumentFairValue_F94B47DC61146A5098151CF345210C14" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentFairValue_F94B47DC61146A5098151CF345210C14" xlink:to="lab_us-gaap_DebtInstrumentFairValue_F94B47DC61146A5098151CF345210C14" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentConvertibleRemainingDiscountAmortizationPeriod1_40E2A1478FB981D831531CF345219E71_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentConvertibleRemainingDiscountAmortizationPeriod1_40E2A1478FB981D831531CF345219E71" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Remaining contractual life of the convertible notes</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentConvertibleRemainingDiscountAmortizationPeriod1_40E2A1478FB981D831531CF345219E71_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentConvertibleRemainingDiscountAmortizationPeriod1_40E2A1478FB981D831531CF345219E71" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Convertible, Remaining Discount Amortization Period</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentConvertibleRemainingDiscountAmortizationPeriod1" xlink:label="loc_us-gaap_DebtInstrumentConvertibleRemainingDiscountAmortizationPeriod1_40E2A1478FB981D831531CF345219E71" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentConvertibleRemainingDiscountAmortizationPeriod1_40E2A1478FB981D831531CF345219E71" xlink:to="lab_us-gaap_DebtInstrumentConvertibleRemainingDiscountAmortizationPeriod1_40E2A1478FB981D831531CF345219E71" xlink:type="arc" />
    <link:label id="lab_us-gaap_InvestmentHoldingsTable_9B8DAB84619293D2FD4BE35B9133B6B3_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentHoldingsTable_9B8DAB84619293D2FD4BE35B9133B6B3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Investment Holdings [Table]</link:label>
    <link:label id="lab_us-gaap_InvestmentHoldingsTable_9B8DAB84619293D2FD4BE35B9133B6B3_label_en-US" xlink:label="lab_us-gaap_InvestmentHoldingsTable_9B8DAB84619293D2FD4BE35B9133B6B3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Investment Holdings [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InvestmentHoldingsTable" xlink:label="loc_us-gaap_InvestmentHoldingsTable_9B8DAB84619293D2FD4BE35B9133B6B3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InvestmentHoldingsTable_9B8DAB84619293D2FD4BE35B9133B6B3" xlink:to="lab_us-gaap_InvestmentHoldingsTable_9B8DAB84619293D2FD4BE35B9133B6B3" xlink:type="arc" />
    <link:label id="lab_us-gaap_InvestmentTypeAxis_27D3D6A2147F18F63AE9E35B913329E6_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentTypeAxis_27D3D6A2147F18F63AE9E35B913329E6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Investment Type [Axis]</link:label>
    <link:label id="lab_us-gaap_InvestmentTypeAxis_27D3D6A2147F18F63AE9E35B913329E6_label_en-US" xlink:label="lab_us-gaap_InvestmentTypeAxis_27D3D6A2147F18F63AE9E35B913329E6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Investment Type [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InvestmentTypeAxis" xlink:label="loc_us-gaap_InvestmentTypeAxis_27D3D6A2147F18F63AE9E35B913329E6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InvestmentTypeAxis_27D3D6A2147F18F63AE9E35B913329E6" xlink:to="lab_us-gaap_InvestmentTypeAxis_27D3D6A2147F18F63AE9E35B913329E6" xlink:type="arc" />
    <link:label id="lab_us-gaap_InvestmentTypeCategorizationMember_52AB7557FD327DD5F62BE35B91333C96_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentTypeCategorizationMember_52AB7557FD327DD5F62BE35B91333C96" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Investments [Domain]</link:label>
    <link:label id="lab_us-gaap_InvestmentTypeCategorizationMember_52AB7557FD327DD5F62BE35B91333C96_label_en-US" xlink:label="lab_us-gaap_InvestmentTypeCategorizationMember_52AB7557FD327DD5F62BE35B91333C96" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Investments [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_52AB7557FD327DD5F62BE35B91333C96" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_52AB7557FD327DD5F62BE35B91333C96" xlink:to="lab_us-gaap_InvestmentTypeCategorizationMember_52AB7557FD327DD5F62BE35B91333C96" xlink:type="arc" />
    <link:label id="lab_us-gaap_InvestmentHoldingsLineItems_68C2D1869E12B18A89CBE35B9133D8A1_terseLabel_en-US" xlink:label="lab_us-gaap_InvestmentHoldingsLineItems_68C2D1869E12B18A89CBE35B9133D8A1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Marketable securities on the balance sheet</link:label>
    <link:label id="lab_us-gaap_InvestmentHoldingsLineItems_68C2D1869E12B18A89CBE35B9133D8A1_label_en-US" xlink:label="lab_us-gaap_InvestmentHoldingsLineItems_68C2D1869E12B18A89CBE35B9133D8A1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Investment Holdings [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InvestmentHoldingsLineItems" xlink:label="loc_us-gaap_InvestmentHoldingsLineItems_68C2D1869E12B18A89CBE35B9133D8A1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InvestmentHoldingsLineItems_68C2D1869E12B18A89CBE35B9133D8A1" xlink:to="lab_us-gaap_InvestmentHoldingsLineItems_68C2D1869E12B18A89CBE35B9133D8A1" xlink:type="arc" />
    <link:label id="lab_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue_B46D2D035C2B88FB83B5E35B91337506_terseLabel_en-US" xlink:label="lab_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue_B46D2D035C2B88FB83B5E35B91337506" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total Marketable securities, Less Than 12 Months</link:label>
    <link:label id="lab_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue_B46D2D035C2B88FB83B5E35B91337506_label_en-US" xlink:label="lab_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue_B46D2D035C2B88FB83B5E35B91337506" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue_B46D2D035C2B88FB83B5E35B91337506" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue_B46D2D035C2B88FB83B5E35B91337506" xlink:to="lab_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue_B46D2D035C2B88FB83B5E35B91337506" xlink:type="arc" />
    <link:label id="lab_ptct_AvailableForSaleSecuritiesDebtMaturitiesOverOneYearFairValue_4148DC98808D7D79B38FE35B91338F53_terseLabel_en-US" xlink:label="lab_ptct_AvailableForSaleSecuritiesDebtMaturitiesOverOneYearFairValue_4148DC98808D7D79B38FE35B91338F53" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total Marketable securities, More Than 12 Months</link:label>
    <link:label id="lab_ptct_AvailableForSaleSecuritiesDebtMaturitiesOverOneYearFairValue_4148DC98808D7D79B38FE35B91338F53_label_en-US" xlink:label="lab_ptct_AvailableForSaleSecuritiesDebtMaturitiesOverOneYearFairValue_4148DC98808D7D79B38FE35B91338F53" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Available For Sale Securities Debt Maturities Over One Year Fair Value</link:label>
    <link:label id="lab_ptct_AvailableForSaleSecuritiesDebtMaturitiesOverOneYearFairValue_4148DC98808D7D79B38FE35B91338F53_documentation_en-US" xlink:label="lab_ptct_AvailableForSaleSecuritiesDebtMaturitiesOverOneYearFairValue_4148DC98808D7D79B38FE35B91338F53" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Amount of available-for-sale debt securities at fair value maturing after the next fiscal year following the latest fiscal year.</link:label>
    <link:loc xlink:href="ptct-20160930.xsd#ptct_AvailableForSaleSecuritiesDebtMaturitiesOverOneYearFairValue" xlink:label="loc_ptct_AvailableForSaleSecuritiesDebtMaturitiesOverOneYearFairValue_4148DC98808D7D79B38FE35B91338F53" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_AvailableForSaleSecuritiesDebtMaturitiesOverOneYearFairValue_4148DC98808D7D79B38FE35B91338F53" xlink:to="lab_ptct_AvailableForSaleSecuritiesDebtMaturitiesOverOneYearFairValue_4148DC98808D7D79B38FE35B91338F53" xlink:type="arc" />
    <link:label id="lab_us-gaap_ComprehensiveIncomeNoteTextBlock_478458451A5230F921831CF345B6A127_terseLabel_en-US" xlink:label="lab_us-gaap_ComprehensiveIncomeNoteTextBlock_478458451A5230F921831CF345B6A127" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other comprehensive income (loss) and accumulated other comprehensive items</link:label>
    <link:label id="lab_us-gaap_ComprehensiveIncomeNoteTextBlock_478458451A5230F921831CF345B6A127_label_en-US" xlink:label="lab_us-gaap_ComprehensiveIncomeNoteTextBlock_478458451A5230F921831CF345B6A127" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Comprehensive Income (Loss) Note [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ComprehensiveIncomeNoteTextBlock" xlink:label="loc_us-gaap_ComprehensiveIncomeNoteTextBlock_478458451A5230F921831CF345B6A127" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ComprehensiveIncomeNoteTextBlock_478458451A5230F921831CF345B6A127" xlink:to="lab_us-gaap_ComprehensiveIncomeNoteTextBlock_478458451A5230F921831CF345B6A127" xlink:type="arc" />
    <link:label id="lab_us-gaap_AccountingPoliciesAbstract_0B7970AF4608F798BC496D888EF360EC_label_en-US" xlink:label="lab_us-gaap_AccountingPoliciesAbstract_0B7970AF4608F798BC496D888EF360EC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accounting Policies [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccountingPoliciesAbstract" xlink:label="loc_us-gaap_AccountingPoliciesAbstract_0B7970AF4608F798BC496D888EF360EC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_0B7970AF4608F798BC496D888EF360EC" xlink:to="lab_us-gaap_AccountingPoliciesAbstract_0B7970AF4608F798BC496D888EF360EC" xlink:type="arc" />
    <link:label id="lab_us-gaap_BasisOfPresentationAndSignificantAccountingPoliciesTextBlock_F1F0EB2A0894A4BC0C306D888EF3810F_terseLabel_en-US" xlink:label="lab_us-gaap_BasisOfPresentationAndSignificantAccountingPoliciesTextBlock_F1F0EB2A0894A4BC0C306D888EF3810F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Summary of significant accounting policies</link:label>
    <link:label id="lab_us-gaap_BasisOfPresentationAndSignificantAccountingPoliciesTextBlock_F1F0EB2A0894A4BC0C306D888EF3810F_label_en-US" xlink:label="lab_us-gaap_BasisOfPresentationAndSignificantAccountingPoliciesTextBlock_F1F0EB2A0894A4BC0C306D888EF3810F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Basis of Presentation and Significant Accounting Policies [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BasisOfPresentationAndSignificantAccountingPoliciesTextBlock" xlink:label="loc_us-gaap_BasisOfPresentationAndSignificantAccountingPoliciesTextBlock_F1F0EB2A0894A4BC0C306D888EF3810F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BasisOfPresentationAndSignificantAccountingPoliciesTextBlock_F1F0EB2A0894A4BC0C306D888EF3810F" xlink:to="lab_us-gaap_BasisOfPresentationAndSignificantAccountingPoliciesTextBlock_F1F0EB2A0894A4BC0C306D888EF3810F" xlink:type="arc" />
    <link:label id="lab_ptct_MinimumAgeOfAmbulatoryPatient_DAA164744027B362077D2261B688C57A_terseLabel_en-US" xlink:label="lab_ptct_MinimumAgeOfAmbulatoryPatient_DAA164744027B362077D2261B688C57A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Minimum age of ambulatory patient</link:label>
    <link:label id="lab_ptct_MinimumAgeOfAmbulatoryPatient_DAA164744027B362077D2261B688C57A_label_en-US" xlink:label="lab_ptct_MinimumAgeOfAmbulatoryPatient_DAA164744027B362077D2261B688C57A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Minimum age of Ambulatory Patient</link:label>
    <link:label id="lab_ptct_MinimumAgeOfAmbulatoryPatient_DAA164744027B362077D2261B688C57A_documentation_en-US" xlink:label="lab_ptct_MinimumAgeOfAmbulatoryPatient_DAA164744027B362077D2261B688C57A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the minimum age of ambulatory patient.</link:label>
    <link:loc xlink:href="ptct-20160930.xsd#ptct_MinimumAgeOfAmbulatoryPatient" xlink:label="loc_ptct_MinimumAgeOfAmbulatoryPatient_DAA164744027B362077D2261B688C57A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_MinimumAgeOfAmbulatoryPatient_DAA164744027B362077D2261B688C57A" xlink:to="lab_ptct_MinimumAgeOfAmbulatoryPatient_DAA164744027B362077D2261B688C57A" xlink:type="arc" />
    <link:label id="lab_ptct_NumberOfStatesInEuropeanEconomicArea_2F3515E547B9941CBA682261B6882759_terseLabel_en-US" xlink:label="lab_ptct_NumberOfStatesInEuropeanEconomicArea_2F3515E547B9941CBA682261B6882759" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of member states of the European Economic Area</link:label>
    <link:label id="lab_ptct_NumberOfStatesInEuropeanEconomicArea_2F3515E547B9941CBA682261B6882759_label_en-US" xlink:label="lab_ptct_NumberOfStatesInEuropeanEconomicArea_2F3515E547B9941CBA682261B6882759" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number of States In European Economic Area</link:label>
    <link:label id="lab_ptct_NumberOfStatesInEuropeanEconomicArea_2F3515E547B9941CBA682261B6882759_documentation_en-US" xlink:label="lab_ptct_NumberOfStatesInEuropeanEconomicArea_2F3515E547B9941CBA682261B6882759" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the number of states in European economic area.</link:label>
    <link:loc xlink:href="ptct-20160930.xsd#ptct_NumberOfStatesInEuropeanEconomicArea" xlink:label="loc_ptct_NumberOfStatesInEuropeanEconomicArea_2F3515E547B9941CBA682261B6882759" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_NumberOfStatesInEuropeanEconomicArea_2F3515E547B9941CBA682261B6882759" xlink:to="lab_ptct_NumberOfStatesInEuropeanEconomicArea_2F3515E547B9941CBA682261B6882759" xlink:type="arc" />
    <link:label id="lab_us-gaap_RetainedEarningsAccumulatedDeficit_291D751086CEF9BD02282261B688DD04_terseLabel_en-US" xlink:label="lab_us-gaap_RetainedEarningsAccumulatedDeficit_291D751086CEF9BD02282261B688DD04" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accumulated deficit</link:label>
    <link:label id="lab_us-gaap_RetainedEarningsAccumulatedDeficit_291D751086CEF9BD02282261B688DD04_label_en-US" xlink:label="lab_us-gaap_RetainedEarningsAccumulatedDeficit_291D751086CEF9BD02282261B688DD04" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Retained Earnings (Accumulated Deficit)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_291D751086CEF9BD02282261B688DD04" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RetainedEarningsAccumulatedDeficit_291D751086CEF9BD02282261B688DD04" xlink:to="lab_us-gaap_RetainedEarningsAccumulatedDeficit_291D751086CEF9BD02282261B688DD04" xlink:type="arc" />
    <link:label id="lab_us-gaap_EarningsPerShareTextBlock_8A3CFD1D4228022251FB6D888E49745E_terseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareTextBlock_8A3CFD1D4228022251FB6D888E49745E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net loss per share</link:label>
    <link:label id="lab_us-gaap_EarningsPerShareTextBlock_8A3CFD1D4228022251FB6D888E49745E_label_en-US" xlink:label="lab_us-gaap_EarningsPerShareTextBlock_8A3CFD1D4228022251FB6D888E49745E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Earnings Per Share [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EarningsPerShareTextBlock" xlink:label="loc_us-gaap_EarningsPerShareTextBlock_8A3CFD1D4228022251FB6D888E49745E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EarningsPerShareTextBlock_8A3CFD1D4228022251FB6D888E49745E" xlink:to="lab_us-gaap_EarningsPerShareTextBlock_8A3CFD1D4228022251FB6D888E49745E" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable_6544FC7F05CCAC6313106D888E6F049F_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable_6544FC7F05CCAC6313106D888E6F049F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Collaborative Arrangements and Non-collaborative Arrangement Transactions [Table]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable_6544FC7F05CCAC6313106D888E6F049F_label_en-US" xlink:label="lab_us-gaap_ScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable_6544FC7F05CCAC6313106D888E6F049F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Collaborative Arrangements and Non-collaborative Arrangement Transactions [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable" xlink:label="loc_us-gaap_ScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable_6544FC7F05CCAC6313106D888E6F049F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable_6544FC7F05CCAC6313106D888E6F049F" xlink:to="lab_us-gaap_ScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable_6544FC7F05CCAC6313106D888E6F049F" xlink:type="arc" />
    <link:label id="lab_us-gaap_TypeOfArrangementAxis_427228D37C1938B026666D888E6F7916_terseLabel_en-US" xlink:label="lab_us-gaap_TypeOfArrangementAxis_427228D37C1938B026666D888E6F7916" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Type of Arrangement and Non-arrangement Transactions [Axis]</link:label>
    <link:label id="lab_us-gaap_TypeOfArrangementAxis_427228D37C1938B026666D888E6F7916_label_en-US" xlink:label="lab_us-gaap_TypeOfArrangementAxis_427228D37C1938B026666D888E6F7916" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Type of Arrangement and Non-arrangement Transactions [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_TypeOfArrangementAxis" xlink:label="loc_us-gaap_TypeOfArrangementAxis_427228D37C1938B026666D888E6F7916" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_TypeOfArrangementAxis_427228D37C1938B026666D888E6F7916" xlink:to="lab_us-gaap_TypeOfArrangementAxis_427228D37C1938B026666D888E6F7916" xlink:type="arc" />
    <link:label id="lab_us-gaap_ArrangementsAndNonarrangementTransactionsMember_231B7EEF81E8C66F59A26D888E6FE21D_terseLabel_en-US" xlink:label="lab_us-gaap_ArrangementsAndNonarrangementTransactionsMember_231B7EEF81E8C66F59A26D888E6FE21D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Arrangements and Non-arrangement Transactions [Domain]</link:label>
    <link:label id="lab_us-gaap_ArrangementsAndNonarrangementTransactionsMember_231B7EEF81E8C66F59A26D888E6FE21D_label_en-US" xlink:label="lab_us-gaap_ArrangementsAndNonarrangementTransactionsMember_231B7EEF81E8C66F59A26D888E6FE21D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Arrangements and Non-arrangement Transactions [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ArrangementsAndNonarrangementTransactionsMember" xlink:label="loc_us-gaap_ArrangementsAndNonarrangementTransactionsMember_231B7EEF81E8C66F59A26D888E6FE21D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ArrangementsAndNonarrangementTransactionsMember_231B7EEF81E8C66F59A26D888E6FE21D" xlink:to="lab_us-gaap_ArrangementsAndNonarrangementTransactionsMember_231B7EEF81E8C66F59A26D888E6FE21D" xlink:type="arc" />
    <link:label id="lab_us-gaap_CollaborativeArrangementProductAgreementMember_2421A84F643EE600F5896D888E6F638D_terseLabel_en-US" xlink:label="lab_us-gaap_CollaborativeArrangementProductAgreementMember_2421A84F643EE600F5896D888E6F638D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Funding agreement</link:label>
    <link:label id="lab_us-gaap_CollaborativeArrangementProductAgreementMember_2421A84F643EE600F5896D888E6F638D_label_en-US" xlink:label="lab_us-gaap_CollaborativeArrangementProductAgreementMember_2421A84F643EE600F5896D888E6F638D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Collaborative Arrangement, Product [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CollaborativeArrangementProductAgreementMember" xlink:label="loc_us-gaap_CollaborativeArrangementProductAgreementMember_2421A84F643EE600F5896D888E6F638D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CollaborativeArrangementProductAgreementMember_2421A84F643EE600F5896D888E6F638D" xlink:to="lab_us-gaap_CollaborativeArrangementProductAgreementMember_2421A84F643EE600F5896D888E6F638D" xlink:type="arc" />
    <link:label id="lab_us-gaap_CounterpartyNameAxis_8E5FA2E768CCCD2FBE956D888E706A88_terseLabel_en-US" xlink:label="lab_us-gaap_CounterpartyNameAxis_8E5FA2E768CCCD2FBE956D888E706A88" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Counterparty Name [Axis]</link:label>
    <link:label id="lab_us-gaap_CounterpartyNameAxis_8E5FA2E768CCCD2FBE956D888E706A88_label_en-US" xlink:label="lab_us-gaap_CounterpartyNameAxis_8E5FA2E768CCCD2FBE956D888E706A88" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Counterparty Name [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CounterpartyNameAxis" xlink:label="loc_us-gaap_CounterpartyNameAxis_8E5FA2E768CCCD2FBE956D888E706A88" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CounterpartyNameAxis_8E5FA2E768CCCD2FBE956D888E706A88" xlink:to="lab_us-gaap_CounterpartyNameAxis_8E5FA2E768CCCD2FBE956D888E706A88" xlink:type="arc" />
    <link:label id="lab_us-gaap_RepurchaseAgreementCounterpartyNameDomain_FB1F3510EBA014CA02756D888E700D72_terseLabel_en-US" xlink:label="lab_us-gaap_RepurchaseAgreementCounterpartyNameDomain_FB1F3510EBA014CA02756D888E700D72" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Counterparty Name [Domain]</link:label>
    <link:label id="lab_us-gaap_RepurchaseAgreementCounterpartyNameDomain_FB1F3510EBA014CA02756D888E700D72_label_en-US" xlink:label="lab_us-gaap_RepurchaseAgreementCounterpartyNameDomain_FB1F3510EBA014CA02756D888E700D72" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Counterparty Name [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RepurchaseAgreementCounterpartyNameDomain" xlink:label="loc_us-gaap_RepurchaseAgreementCounterpartyNameDomain_FB1F3510EBA014CA02756D888E700D72" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RepurchaseAgreementCounterpartyNameDomain_FB1F3510EBA014CA02756D888E700D72" xlink:to="lab_us-gaap_RepurchaseAgreementCounterpartyNameDomain_FB1F3510EBA014CA02756D888E700D72" xlink:type="arc" />
    <link:label id="lab_ptct_WellcomeTrustLimitedMember_DF32EF052DEC1150AA976D888E70166E_terseLabel_en-US" xlink:label="lab_ptct_WellcomeTrustLimitedMember_DF32EF052DEC1150AA976D888E70166E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Wellcome trust</link:label>
    <link:label id="lab_ptct_WellcomeTrustLimitedMember_DF32EF052DEC1150AA976D888E70166E_label_en-US" xlink:label="lab_ptct_WellcomeTrustLimitedMember_DF32EF052DEC1150AA976D888E70166E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Wellcome Trust Limited [Member]</link:label>
    <link:label id="lab_ptct_WellcomeTrustLimitedMember_DF32EF052DEC1150AA976D888E70166E_documentation_en-US" xlink:label="lab_ptct_WellcomeTrustLimitedMember_DF32EF052DEC1150AA976D888E70166E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information pertaining to The Wellcome Trust Limited.</link:label>
    <link:loc xlink:href="ptct-20160930.xsd#ptct_WellcomeTrustLimitedMember" xlink:label="loc_ptct_WellcomeTrustLimitedMember_DF32EF052DEC1150AA976D888E70166E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_WellcomeTrustLimitedMember_DF32EF052DEC1150AA976D888E70166E" xlink:to="lab_ptct_WellcomeTrustLimitedMember_DF32EF052DEC1150AA976D888E70166E" xlink:type="arc" />
    <link:label id="lab_us-gaap_StatementLineItems_6627BF28B4AB3CB40E5A6D888E700696_verboseLabel_en-US" xlink:label="lab_us-gaap_StatementLineItems_6627BF28B4AB3CB40E5A6D888E700696" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Statement [Line Items]</link:label>
    <link:label id="lab_us-gaap_StatementLineItems_6627BF28B4AB3CB40E5A6D888E700696_label_en-US" xlink:label="lab_us-gaap_StatementLineItems_6627BF28B4AB3CB40E5A6D888E700696" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_6627BF28B4AB3CB40E5A6D888E700696" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StatementLineItems_6627BF28B4AB3CB40E5A6D888E700696" xlink:to="lab_us-gaap_StatementLineItems_6627BF28B4AB3CB40E5A6D888E700696" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherCommitmentsAbstract_E9E9CF05C0B4E61796656D888E70EDA6_terseLabel_en-US" xlink:label="lab_us-gaap_OtherCommitmentsAbstract_E9E9CF05C0B4E61796656D888E70EDA6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other Commitments [Abstract]</link:label>
    <link:label id="lab_us-gaap_OtherCommitmentsAbstract_E9E9CF05C0B4E61796656D888E70EDA6_label_en-US" xlink:label="lab_us-gaap_OtherCommitmentsAbstract_E9E9CF05C0B4E61796656D888E70EDA6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Commitments [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherCommitmentsAbstract" xlink:label="loc_us-gaap_OtherCommitmentsAbstract_E9E9CF05C0B4E61796656D888E70EDA6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherCommitmentsAbstract_E9E9CF05C0B4E61796656D888E70EDA6" xlink:to="lab_us-gaap_OtherCommitmentsAbstract_E9E9CF05C0B4E61796656D888E70EDA6" xlink:type="arc" />
    <link:label id="lab_ptct_DevelopmentAndRegulatoryMilestonePaymentObligations_F0DCCD4FC5B6861734CE6D888E703AF9_terseLabel_en-US" xlink:label="lab_ptct_DevelopmentAndRegulatoryMilestonePaymentObligations_F0DCCD4FC5B6861734CE6D888E703AF9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Development and regulatory milestone payments which the entity may be obligated to pay</link:label>
    <link:label id="lab_ptct_DevelopmentAndRegulatoryMilestonePaymentObligations_F0DCCD4FC5B6861734CE6D888E703AF9_label_en-US" xlink:label="lab_ptct_DevelopmentAndRegulatoryMilestonePaymentObligations_F0DCCD4FC5B6861734CE6D888E703AF9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Development And Regulatory Milestone Payment Obligations</link:label>
    <link:label id="lab_ptct_DevelopmentAndRegulatoryMilestonePaymentObligations_F0DCCD4FC5B6861734CE6D888E703AF9_documentation_en-US" xlink:label="lab_ptct_DevelopmentAndRegulatoryMilestonePaymentObligations_F0DCCD4FC5B6861734CE6D888E703AF9" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the development and regulatory milestones payments which the entity may be obligated to pay under certain contractual agreements.</link:label>
    <link:loc xlink:href="ptct-20160930.xsd#ptct_DevelopmentAndRegulatoryMilestonePaymentObligations" xlink:label="loc_ptct_DevelopmentAndRegulatoryMilestonePaymentObligations_F0DCCD4FC5B6861734CE6D888E703AF9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_DevelopmentAndRegulatoryMilestonePaymentObligations_F0DCCD4FC5B6861734CE6D888E703AF9" xlink:to="lab_ptct_DevelopmentAndRegulatoryMilestonePaymentObligations_F0DCCD4FC5B6861734CE6D888E703AF9" xlink:type="arc" />
    <link:label id="lab_ptct_DocumentAndEntityInformationAbstract_BFB13E21B02236B381266D888E30508A_label_en-US" xlink:label="lab_ptct_DocumentAndEntityInformationAbstract_BFB13E21B02236B381266D888E30508A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Document and Entity Information</link:label>
    <link:label id="lab_ptct_DocumentAndEntityInformationAbstract_BFB13E21B02236B381266D888E30508A_documentation_en-US" xlink:label="lab_ptct_DocumentAndEntityInformationAbstract_BFB13E21B02236B381266D888E30508A" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">No definition available.</link:label>
    <link:loc xlink:href="ptct-20160930.xsd#ptct_DocumentAndEntityInformationAbstract" xlink:label="loc_ptct_DocumentAndEntityInformationAbstract_BFB13E21B02236B381266D888E30508A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_DocumentAndEntityInformationAbstract_BFB13E21B02236B381266D888E30508A" xlink:to="lab_ptct_DocumentAndEntityInformationAbstract_BFB13E21B02236B381266D888E30508A" xlink:type="arc" />
    <link:label id="lab_dei_EntityRegistrantName_CF8AC58B43D8B058513D6D888E303130_terseLabel_en-US" xlink:label="lab_dei_EntityRegistrantName_CF8AC58B43D8B058513D6D888E303130" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Registrant Name</link:label>
    <link:label id="lab_dei_EntityRegistrantName_CF8AC58B43D8B058513D6D888E303130_label_en-US" xlink:label="lab_dei_EntityRegistrantName_CF8AC58B43D8B058513D6D888E303130" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Registrant Name</link:label>
    <link:loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityRegistrantName" xlink:label="loc_dei_EntityRegistrantName_CF8AC58B43D8B058513D6D888E303130" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityRegistrantName_CF8AC58B43D8B058513D6D888E303130" xlink:to="lab_dei_EntityRegistrantName_CF8AC58B43D8B058513D6D888E303130" xlink:type="arc" />
    <link:label id="lab_dei_EntityCentralIndexKey_257719A6EA6B11DEB4826D888E309AAA_terseLabel_en-US" xlink:label="lab_dei_EntityCentralIndexKey_257719A6EA6B11DEB4826D888E309AAA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Central Index Key</link:label>
    <link:label id="lab_dei_EntityCentralIndexKey_257719A6EA6B11DEB4826D888E309AAA_label_en-US" xlink:label="lab_dei_EntityCentralIndexKey_257719A6EA6B11DEB4826D888E309AAA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Central Index Key</link:label>
    <link:loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityCentralIndexKey" xlink:label="loc_dei_EntityCentralIndexKey_257719A6EA6B11DEB4826D888E309AAA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityCentralIndexKey_257719A6EA6B11DEB4826D888E309AAA" xlink:to="lab_dei_EntityCentralIndexKey_257719A6EA6B11DEB4826D888E309AAA" xlink:type="arc" />
    <link:label id="lab_dei_DocumentType_C8A9C2F881E3BC3828016D888E306749_terseLabel_en-US" xlink:label="lab_dei_DocumentType_C8A9C2F881E3BC3828016D888E306749" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Document Type</link:label>
    <link:label id="lab_dei_DocumentType_C8A9C2F881E3BC3828016D888E306749_label_en-US" xlink:label="lab_dei_DocumentType_C8A9C2F881E3BC3828016D888E306749" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Document Type</link:label>
    <link:loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_DocumentType" xlink:label="loc_dei_DocumentType_C8A9C2F881E3BC3828016D888E306749" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentType_C8A9C2F881E3BC3828016D888E306749" xlink:to="lab_dei_DocumentType_C8A9C2F881E3BC3828016D888E306749" xlink:type="arc" />
    <link:label id="lab_dei_DocumentPeriodEndDate_4ED533FA8CC238A3E81F6D888E30E37A_terseLabel_en-US" xlink:label="lab_dei_DocumentPeriodEndDate_4ED533FA8CC238A3E81F6D888E30E37A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Document Period End Date</link:label>
    <link:label id="lab_dei_DocumentPeriodEndDate_4ED533FA8CC238A3E81F6D888E30E37A_label_en-US" xlink:label="lab_dei_DocumentPeriodEndDate_4ED533FA8CC238A3E81F6D888E30E37A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Document Period End Date</link:label>
    <link:loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_DocumentPeriodEndDate" xlink:label="loc_dei_DocumentPeriodEndDate_4ED533FA8CC238A3E81F6D888E30E37A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentPeriodEndDate_4ED533FA8CC238A3E81F6D888E30E37A" xlink:to="lab_dei_DocumentPeriodEndDate_4ED533FA8CC238A3E81F6D888E30E37A" xlink:type="arc" />
    <link:label id="lab_dei_AmendmentFlag_72BCB98BD93578E0B2FA6D888E306BC7_terseLabel_en-US" xlink:label="lab_dei_AmendmentFlag_72BCB98BD93578E0B2FA6D888E306BC7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amendment Flag</link:label>
    <link:label id="lab_dei_AmendmentFlag_72BCB98BD93578E0B2FA6D888E306BC7_label_en-US" xlink:label="lab_dei_AmendmentFlag_72BCB98BD93578E0B2FA6D888E306BC7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Amendment Flag</link:label>
    <link:loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_AmendmentFlag" xlink:label="loc_dei_AmendmentFlag_72BCB98BD93578E0B2FA6D888E306BC7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_AmendmentFlag_72BCB98BD93578E0B2FA6D888E306BC7" xlink:to="lab_dei_AmendmentFlag_72BCB98BD93578E0B2FA6D888E306BC7" xlink:type="arc" />
    <link:label id="lab_dei_CurrentFiscalYearEndDate_03D881AA5D5DFCD4D5CA6D888E300FB0_terseLabel_en-US" xlink:label="lab_dei_CurrentFiscalYearEndDate_03D881AA5D5DFCD4D5CA6D888E300FB0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Current Fiscal Year End Date</link:label>
    <link:label id="lab_dei_CurrentFiscalYearEndDate_03D881AA5D5DFCD4D5CA6D888E300FB0_label_en-US" xlink:label="lab_dei_CurrentFiscalYearEndDate_03D881AA5D5DFCD4D5CA6D888E300FB0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Current Fiscal Year End Date</link:label>
    <link:loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_CurrentFiscalYearEndDate" xlink:label="loc_dei_CurrentFiscalYearEndDate_03D881AA5D5DFCD4D5CA6D888E300FB0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_CurrentFiscalYearEndDate_03D881AA5D5DFCD4D5CA6D888E300FB0" xlink:to="lab_dei_CurrentFiscalYearEndDate_03D881AA5D5DFCD4D5CA6D888E300FB0" xlink:type="arc" />
    <link:label id="lab_dei_EntityCurrentReportingStatus_A51BAF1CA295B59D53776D888E309A5E_terseLabel_en-US" xlink:label="lab_dei_EntityCurrentReportingStatus_A51BAF1CA295B59D53776D888E309A5E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Current Reporting Status</link:label>
    <link:label id="lab_dei_EntityCurrentReportingStatus_A51BAF1CA295B59D53776D888E309A5E_label_en-US" xlink:label="lab_dei_EntityCurrentReportingStatus_A51BAF1CA295B59D53776D888E309A5E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Current Reporting Status</link:label>
    <link:loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityCurrentReportingStatus" xlink:label="loc_dei_EntityCurrentReportingStatus_A51BAF1CA295B59D53776D888E309A5E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityCurrentReportingStatus_A51BAF1CA295B59D53776D888E309A5E" xlink:to="lab_dei_EntityCurrentReportingStatus_A51BAF1CA295B59D53776D888E309A5E" xlink:type="arc" />
    <link:label id="lab_dei_EntityFilerCategory_787B63097BA32D42E6516D888E30A71D_terseLabel_en-US" xlink:label="lab_dei_EntityFilerCategory_787B63097BA32D42E6516D888E30A71D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Filer Category</link:label>
    <link:label id="lab_dei_EntityFilerCategory_787B63097BA32D42E6516D888E30A71D_label_en-US" xlink:label="lab_dei_EntityFilerCategory_787B63097BA32D42E6516D888E30A71D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Filer Category</link:label>
    <link:loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityFilerCategory" xlink:label="loc_dei_EntityFilerCategory_787B63097BA32D42E6516D888E30A71D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityFilerCategory_787B63097BA32D42E6516D888E30A71D" xlink:to="lab_dei_EntityFilerCategory_787B63097BA32D42E6516D888E30A71D" xlink:type="arc" />
    <link:label id="lab_dei_EntityCommonStockSharesOutstanding_42C4D9BAF018F0B0EA7B6D888E30385E_terseLabel_en-US" xlink:label="lab_dei_EntityCommonStockSharesOutstanding_42C4D9BAF018F0B0EA7B6D888E30385E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Entity Common Stock, Shares Outstanding</link:label>
    <link:label id="lab_dei_EntityCommonStockSharesOutstanding_42C4D9BAF018F0B0EA7B6D888E30385E_label_en-US" xlink:label="lab_dei_EntityCommonStockSharesOutstanding_42C4D9BAF018F0B0EA7B6D888E30385E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Entity Common Stock, Shares Outstanding</link:label>
    <link:loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_EntityCommonStockSharesOutstanding" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_42C4D9BAF018F0B0EA7B6D888E30385E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_EntityCommonStockSharesOutstanding_42C4D9BAF018F0B0EA7B6D888E30385E" xlink:to="lab_dei_EntityCommonStockSharesOutstanding_42C4D9BAF018F0B0EA7B6D888E30385E" xlink:type="arc" />
    <link:label id="lab_dei_DocumentFiscalYearFocus_6D231E9D6C322728D0576D888E3036B5_terseLabel_en-US" xlink:label="lab_dei_DocumentFiscalYearFocus_6D231E9D6C322728D0576D888E3036B5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Document Fiscal Year Focus</link:label>
    <link:label id="lab_dei_DocumentFiscalYearFocus_6D231E9D6C322728D0576D888E3036B5_label_en-US" xlink:label="lab_dei_DocumentFiscalYearFocus_6D231E9D6C322728D0576D888E3036B5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Document Fiscal Year Focus</link:label>
    <link:loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_DocumentFiscalYearFocus" xlink:label="loc_dei_DocumentFiscalYearFocus_6D231E9D6C322728D0576D888E3036B5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentFiscalYearFocus_6D231E9D6C322728D0576D888E3036B5" xlink:to="lab_dei_DocumentFiscalYearFocus_6D231E9D6C322728D0576D888E3036B5" xlink:type="arc" />
    <link:label id="lab_dei_DocumentFiscalPeriodFocus_3536E7416B17DBDE07716D888E30CAEA_terseLabel_en-US" xlink:label="lab_dei_DocumentFiscalPeriodFocus_3536E7416B17DBDE07716D888E30CAEA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Document Fiscal Period Focus</link:label>
    <link:label id="lab_dei_DocumentFiscalPeriodFocus_3536E7416B17DBDE07716D888E30CAEA_label_en-US" xlink:label="lab_dei_DocumentFiscalPeriodFocus_3536E7416B17DBDE07716D888E30CAEA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Document Fiscal Period Focus</link:label>
    <link:loc xlink:href="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd#dei_DocumentFiscalPeriodFocus" xlink:label="loc_dei_DocumentFiscalPeriodFocus_3536E7416B17DBDE07716D888E30CAEA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_dei_DocumentFiscalPeriodFocus_3536E7416B17DBDE07716D888E30CAEA" xlink:to="lab_dei_DocumentFiscalPeriodFocus_3536E7416B17DBDE07716D888E30CAEA" xlink:type="arc" />
    <link:label id="lab_us-gaap_AssetsAbstract_29218D4C0489D3C728E21CF3460761B8_terseLabel_en-US" xlink:label="lab_us-gaap_AssetsAbstract_29218D4C0489D3C728E21CF3460761B8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Assets</link:label>
    <link:label id="lab_us-gaap_AssetsAbstract_29218D4C0489D3C728E21CF3460761B8_label_en-US" xlink:label="lab_us-gaap_AssetsAbstract_29218D4C0489D3C728E21CF3460761B8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssetsAbstract" xlink:label="loc_us-gaap_AssetsAbstract_29218D4C0489D3C728E21CF3460761B8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AssetsAbstract_29218D4C0489D3C728E21CF3460761B8" xlink:to="lab_us-gaap_AssetsAbstract_29218D4C0489D3C728E21CF3460761B8" xlink:type="arc" />
    <link:label id="lab_us-gaap_AssetsCurrentAbstract_47EA49C1F3A90DCDC90F1CF34607F01D_terseLabel_en-US" xlink:label="lab_us-gaap_AssetsCurrentAbstract_47EA49C1F3A90DCDC90F1CF34607F01D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Current assets:</link:label>
    <link:label id="lab_us-gaap_AssetsCurrentAbstract_47EA49C1F3A90DCDC90F1CF34607F01D_label_en-US" xlink:label="lab_us-gaap_AssetsCurrentAbstract_47EA49C1F3A90DCDC90F1CF34607F01D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets, Current [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="loc_us-gaap_AssetsCurrentAbstract_47EA49C1F3A90DCDC90F1CF34607F01D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AssetsCurrentAbstract_47EA49C1F3A90DCDC90F1CF34607F01D" xlink:to="lab_us-gaap_AssetsCurrentAbstract_47EA49C1F3A90DCDC90F1CF34607F01D" xlink:type="arc" />
    <link:label id="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_5261D098C6A92A49DA701CF346076C65_terseLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_5261D098C6A92A49DA701CF346076C65" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash and cash equivalents</link:label>
    <link:label id="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_5261D098C6A92A49DA701CF346076C65_label_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_5261D098C6A92A49DA701CF346076C65" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash and Cash Equivalents, at Carrying Value</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_5261D098C6A92A49DA701CF346076C65" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_5261D098C6A92A49DA701CF346076C65" xlink:to="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_5261D098C6A92A49DA701CF346076C65" xlink:type="arc" />
    <link:label id="lab_us-gaap_MarketableSecuritiesCurrent_783F05CD12921A7BA0CC1CF34608D3F5_terseLabel_en-US" xlink:label="lab_us-gaap_MarketableSecuritiesCurrent_783F05CD12921A7BA0CC1CF34608D3F5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Marketable securities</link:label>
    <link:label id="lab_us-gaap_MarketableSecuritiesCurrent_783F05CD12921A7BA0CC1CF34608D3F5_label_en-US" xlink:label="lab_us-gaap_MarketableSecuritiesCurrent_783F05CD12921A7BA0CC1CF34608D3F5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Marketable Securities, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_MarketableSecuritiesCurrent" xlink:label="loc_us-gaap_MarketableSecuritiesCurrent_783F05CD12921A7BA0CC1CF34608D3F5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_MarketableSecuritiesCurrent_783F05CD12921A7BA0CC1CF34608D3F5" xlink:to="lab_us-gaap_MarketableSecuritiesCurrent_783F05CD12921A7BA0CC1CF34608D3F5" xlink:type="arc" />
    <link:label id="lab_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_C1EC3352900471E1F48B1CF34608C4F3_terseLabel_en-US" xlink:label="lab_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_C1EC3352900471E1F48B1CF34608C4F3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Prepaid expenses and other current assets</link:label>
    <link:label id="lab_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_C1EC3352900471E1F48B1CF34608C4F3_label_en-US" xlink:label="lab_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_C1EC3352900471E1F48B1CF34608C4F3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Prepaid Expense and Other Assets, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_C1EC3352900471E1F48B1CF34608C4F3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_C1EC3352900471E1F48B1CF34608C4F3" xlink:to="lab_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_C1EC3352900471E1F48B1CF34608C4F3" xlink:type="arc" />
    <link:label id="lab_us-gaap_ReceivablesNetCurrent_CDF7E3B75DA5B76BF4DF1CF34608C5DE_terseLabel_en-US" xlink:label="lab_us-gaap_ReceivablesNetCurrent_CDF7E3B75DA5B76BF4DF1CF34608C5DE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Trade receivables, net</link:label>
    <link:label id="lab_us-gaap_ReceivablesNetCurrent_CDF7E3B75DA5B76BF4DF1CF34608C5DE_label_en-US" xlink:label="lab_us-gaap_ReceivablesNetCurrent_CDF7E3B75DA5B76BF4DF1CF34608C5DE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Receivables, Net, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ReceivablesNetCurrent" xlink:label="loc_us-gaap_ReceivablesNetCurrent_CDF7E3B75DA5B76BF4DF1CF34608C5DE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ReceivablesNetCurrent_CDF7E3B75DA5B76BF4DF1CF34608C5DE" xlink:to="lab_us-gaap_ReceivablesNetCurrent_CDF7E3B75DA5B76BF4DF1CF34608C5DE" xlink:type="arc" />
    <link:label id="lab_us-gaap_AssetsCurrent_2BE8E26B8A78B95BB60A1CF346080CEF_totalLabel_en-US" xlink:label="lab_us-gaap_AssetsCurrent_2BE8E26B8A78B95BB60A1CF346080CEF" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total current assets</link:label>
    <link:label id="lab_us-gaap_AssetsCurrent_2BE8E26B8A78B95BB60A1CF346080CEF_label_en-US" xlink:label="lab_us-gaap_AssetsCurrent_2BE8E26B8A78B95BB60A1CF346080CEF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="loc_us-gaap_AssetsCurrent_2BE8E26B8A78B95BB60A1CF346080CEF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AssetsCurrent_2BE8E26B8A78B95BB60A1CF346080CEF" xlink:to="lab_us-gaap_AssetsCurrent_2BE8E26B8A78B95BB60A1CF346080CEF" xlink:type="arc" />
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentNet_67FE4E45A9BD0A0ADC4F1CF34608E0EC_terseLabel_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentNet_67FE4E45A9BD0A0ADC4F1CF34608E0EC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fixed assets, net</link:label>
    <link:label id="lab_us-gaap_PropertyPlantAndEquipmentNet_67FE4E45A9BD0A0ADC4F1CF34608E0EC_label_en-US" xlink:label="lab_us-gaap_PropertyPlantAndEquipmentNet_67FE4E45A9BD0A0ADC4F1CF34608E0EC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Property, Plant and Equipment, Net</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_67FE4E45A9BD0A0ADC4F1CF34608E0EC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNet_67FE4E45A9BD0A0ADC4F1CF34608E0EC" xlink:to="lab_us-gaap_PropertyPlantAndEquipmentNet_67FE4E45A9BD0A0ADC4F1CF34608E0EC" xlink:type="arc" />
    <link:label id="lab_ptct_DepositsAndOtherAssetsNoncurrent_383B6D963E7DBF970A7D1CF34608F22B_terseLabel_en-US" xlink:label="lab_ptct_DepositsAndOtherAssetsNoncurrent_383B6D963E7DBF970A7D1CF34608F22B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Deposits and other assets</link:label>
    <link:label id="lab_ptct_DepositsAndOtherAssetsNoncurrent_383B6D963E7DBF970A7D1CF34608F22B_label_en-US" xlink:label="lab_ptct_DepositsAndOtherAssetsNoncurrent_383B6D963E7DBF970A7D1CF34608F22B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deposits and Other Assets Noncurrent</link:label>
    <link:label id="lab_ptct_DepositsAndOtherAssetsNoncurrent_383B6D963E7DBF970A7D1CF34608F22B_documentation_en-US" xlink:label="lab_ptct_DepositsAndOtherAssetsNoncurrent_383B6D963E7DBF970A7D1CF34608F22B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the carrying value of amounts transferred to third parties for security purposes and other noncurrent assets that are expected to be returned or applied towards payment after one year or beyond the operating cycle, if longer.</link:label>
    <link:loc xlink:href="ptct-20160930.xsd#ptct_DepositsAndOtherAssetsNoncurrent" xlink:label="loc_ptct_DepositsAndOtherAssetsNoncurrent_383B6D963E7DBF970A7D1CF34608F22B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_DepositsAndOtherAssetsNoncurrent_383B6D963E7DBF970A7D1CF34608F22B" xlink:to="lab_ptct_DepositsAndOtherAssetsNoncurrent_383B6D963E7DBF970A7D1CF34608F22B" xlink:type="arc" />
    <link:label id="lab_us-gaap_Assets_E3FAE8FBBE78B581ECED1CF34608A2E2_totalLabel_en-US" xlink:label="lab_us-gaap_Assets_E3FAE8FBBE78B581ECED1CF34608A2E2" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total assets</link:label>
    <link:label id="lab_us-gaap_Assets_E3FAE8FBBE78B581ECED1CF34608A2E2_label_en-US" xlink:label="lab_us-gaap_Assets_E3FAE8FBBE78B581ECED1CF34608A2E2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Assets</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_E3FAE8FBBE78B581ECED1CF34608A2E2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_Assets_E3FAE8FBBE78B581ECED1CF34608A2E2" xlink:to="lab_us-gaap_Assets_E3FAE8FBBE78B581ECED1CF34608A2E2" xlink:type="arc" />
    <link:label id="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_F107A7DC395321BF998B1CF34608E275_verboseLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_F107A7DC395321BF998B1CF34608E275" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Liabilities and stockholders&#8217; equity</link:label>
    <link:label id="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_F107A7DC395321BF998B1CF34608E275_label_en-US" xlink:label="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_F107A7DC395321BF998B1CF34608E275" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liabilities and Equity [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_F107A7DC395321BF998B1CF34608E275" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_F107A7DC395321BF998B1CF34608E275" xlink:to="lab_us-gaap_LiabilitiesAndStockholdersEquityAbstract_F107A7DC395321BF998B1CF34608E275" xlink:type="arc" />
    <link:label id="lab_us-gaap_LiabilitiesCurrentAbstract_28153D793190619649F21CF34608DC35_terseLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrentAbstract_28153D793190619649F21CF34608DC35" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Current liabilities:</link:label>
    <link:label id="lab_us-gaap_LiabilitiesCurrentAbstract_28153D793190619649F21CF34608DC35_label_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrentAbstract_28153D793190619649F21CF34608DC35" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liabilities, Current [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract_28153D793190619649F21CF34608DC35" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_28153D793190619649F21CF34608DC35" xlink:to="lab_us-gaap_LiabilitiesCurrentAbstract_28153D793190619649F21CF34608DC35" xlink:type="arc" />
    <link:label id="lab_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_5684CB82DDEF93BA547B1CF346086525_terseLabel_en-US" xlink:label="lab_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_5684CB82DDEF93BA547B1CF346086525" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accounts payable and accrued expenses</link:label>
    <link:label id="lab_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_5684CB82DDEF93BA547B1CF346086525_label_en-US" xlink:label="lab_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_5684CB82DDEF93BA547B1CF346086525" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accounts Payable and Accrued Liabilities, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent" xlink:label="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_5684CB82DDEF93BA547B1CF346086525" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_5684CB82DDEF93BA547B1CF346086525" xlink:to="lab_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_5684CB82DDEF93BA547B1CF346086525" xlink:type="arc" />
    <link:label id="lab_us-gaap_DeferredRevenueCurrent_28A3AF362F17DF2CE8141CF34608AC36_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredRevenueCurrent_28A3AF362F17DF2CE8141CF34608AC36" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Deferred revenue</link:label>
    <link:label id="lab_us-gaap_DeferredRevenueCurrent_28A3AF362F17DF2CE8141CF34608AC36_label_en-US" xlink:label="lab_us-gaap_DeferredRevenueCurrent_28A3AF362F17DF2CE8141CF34608AC36" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Revenue, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredRevenueCurrent" xlink:label="loc_us-gaap_DeferredRevenueCurrent_28A3AF362F17DF2CE8141CF34608AC36" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredRevenueCurrent_28A3AF362F17DF2CE8141CF34608AC36" xlink:to="lab_us-gaap_DeferredRevenueCurrent_28A3AF362F17DF2CE8141CF34608AC36" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherLiabilitiesCurrent_C9BFCE83FA4770BB990F1CF346084403_terseLabel_en-US" xlink:label="lab_us-gaap_OtherLiabilitiesCurrent_C9BFCE83FA4770BB990F1CF346084403" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other current liabilities</link:label>
    <link:label id="lab_us-gaap_OtherLiabilitiesCurrent_C9BFCE83FA4770BB990F1CF346084403_label_en-US" xlink:label="lab_us-gaap_OtherLiabilitiesCurrent_C9BFCE83FA4770BB990F1CF346084403" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Liabilities, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherLiabilitiesCurrent" xlink:label="loc_us-gaap_OtherLiabilitiesCurrent_C9BFCE83FA4770BB990F1CF346084403" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherLiabilitiesCurrent_C9BFCE83FA4770BB990F1CF346084403" xlink:to="lab_us-gaap_OtherLiabilitiesCurrent_C9BFCE83FA4770BB990F1CF346084403" xlink:type="arc" />
    <link:label id="lab_us-gaap_LiabilitiesCurrent_25421BCF168CC6ED07C21CF346086488_totalLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrent_25421BCF168CC6ED07C21CF346086488" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total current liabilities</link:label>
    <link:label id="lab_us-gaap_LiabilitiesCurrent_25421BCF168CC6ED07C21CF346086488_label_en-US" xlink:label="lab_us-gaap_LiabilitiesCurrent_25421BCF168CC6ED07C21CF346086488" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liabilities, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="loc_us-gaap_LiabilitiesCurrent_25421BCF168CC6ED07C21CF346086488" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LiabilitiesCurrent_25421BCF168CC6ED07C21CF346086488" xlink:to="lab_us-gaap_LiabilitiesCurrent_25421BCF168CC6ED07C21CF346086488" xlink:type="arc" />
    <link:label id="lab_us-gaap_LongTermDebtNoncurrent_E52C5E42FEA7EFA860FD1CF34609BA3F_verboseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtNoncurrent_E52C5E42FEA7EFA860FD1CF34609BA3F" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Long-term debt</link:label>
    <link:label id="lab_us-gaap_LongTermDebtNoncurrent_E52C5E42FEA7EFA860FD1CF34609BA3F_label_en-US" xlink:label="lab_us-gaap_LongTermDebtNoncurrent_E52C5E42FEA7EFA860FD1CF34609BA3F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt, Excluding Current Maturities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongTermDebtNoncurrent" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_E52C5E42FEA7EFA860FD1CF34609BA3F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongTermDebtNoncurrent_E52C5E42FEA7EFA860FD1CF34609BA3F" xlink:to="lab_us-gaap_LongTermDebtNoncurrent_E52C5E42FEA7EFA860FD1CF34609BA3F" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherLiabilitiesNoncurrent_53F91ED3CCFEAF4CDC1C1CF3460979EE_terseLabel_en-US" xlink:label="lab_us-gaap_OtherLiabilitiesNoncurrent_53F91ED3CCFEAF4CDC1C1CF3460979EE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other long-term liabilities</link:label>
    <link:label id="lab_us-gaap_OtherLiabilitiesNoncurrent_53F91ED3CCFEAF4CDC1C1CF3460979EE_label_en-US" xlink:label="lab_us-gaap_OtherLiabilitiesNoncurrent_53F91ED3CCFEAF4CDC1C1CF3460979EE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Liabilities, Noncurrent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_53F91ED3CCFEAF4CDC1C1CF3460979EE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherLiabilitiesNoncurrent_53F91ED3CCFEAF4CDC1C1CF3460979EE" xlink:to="lab_us-gaap_OtherLiabilitiesNoncurrent_53F91ED3CCFEAF4CDC1C1CF3460979EE" xlink:type="arc" />
    <link:label id="lab_us-gaap_Liabilities_30D6D34CFEE83408CB0A1CF346091E55_totalLabel_en-US" xlink:label="lab_us-gaap_Liabilities_30D6D34CFEE83408CB0A1CF346091E55" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total liabilities</link:label>
    <link:label id="lab_us-gaap_Liabilities_30D6D34CFEE83408CB0A1CF346091E55_label_en-US" xlink:label="lab_us-gaap_Liabilities_30D6D34CFEE83408CB0A1CF346091E55" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liabilities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaap_Liabilities_30D6D34CFEE83408CB0A1CF346091E55" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_Liabilities_30D6D34CFEE83408CB0A1CF346091E55" xlink:to="lab_us-gaap_Liabilities_30D6D34CFEE83408CB0A1CF346091E55" xlink:type="arc" />
    <link:label id="lab_us-gaap_StockholdersEquityAbstract_F17EC268456F00F4D18A1CF346097422_verboseLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquityAbstract_F17EC268456F00F4D18A1CF346097422" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Stockholders&#8217; equity:</link:label>
    <link:label id="lab_us-gaap_StockholdersEquityAbstract_F17EC268456F00F4D18A1CF346097422_label_en-US" xlink:label="lab_us-gaap_StockholdersEquityAbstract_F17EC268456F00F4D18A1CF346097422" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stockholders' Equity Attributable to Parent [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockholdersEquityAbstract" xlink:label="loc_us-gaap_StockholdersEquityAbstract_F17EC268456F00F4D18A1CF346097422" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockholdersEquityAbstract_F17EC268456F00F4D18A1CF346097422" xlink:to="lab_us-gaap_StockholdersEquityAbstract_F17EC268456F00F4D18A1CF346097422" xlink:type="arc" />
    <link:label id="lab_us-gaap_CommonStockValue_535D167AE5BDC9BBBDAD1CF34609A739_verboseLabel_en-US" xlink:label="lab_us-gaap_CommonStockValue_535D167AE5BDC9BBBDAD1CF34609A739" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Common stock, $0.001 par value. Authorized 125,000,000 shares; issued and outstanding 34,165,519 shares at September 30, 2016. Authorized 125,000,000 shares; issued and outstanding 33,916,559 shares at December 31, 2015</link:label>
    <link:label id="lab_us-gaap_CommonStockValue_535D167AE5BDC9BBBDAD1CF34609A739_label_en-US" xlink:label="lab_us-gaap_CommonStockValue_535D167AE5BDC9BBBDAD1CF34609A739" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Common Stock, Value, Issued</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CommonStockValue" xlink:label="loc_us-gaap_CommonStockValue_535D167AE5BDC9BBBDAD1CF34609A739" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CommonStockValue_535D167AE5BDC9BBBDAD1CF34609A739" xlink:to="lab_us-gaap_CommonStockValue_535D167AE5BDC9BBBDAD1CF34609A739" xlink:type="arc" />
    <link:label id="lab_us-gaap_AdditionalPaidInCapital_F290E43A7848D57663521CF34609AF75_terseLabel_en-US" xlink:label="lab_us-gaap_AdditionalPaidInCapital_F290E43A7848D57663521CF34609AF75" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Additional paid-in capital</link:label>
    <link:label id="lab_us-gaap_AdditionalPaidInCapital_F290E43A7848D57663521CF34609AF75_label_en-US" xlink:label="lab_us-gaap_AdditionalPaidInCapital_F290E43A7848D57663521CF34609AF75" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Additional Paid in Capital</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AdditionalPaidInCapital" xlink:label="loc_us-gaap_AdditionalPaidInCapital_F290E43A7848D57663521CF34609AF75" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AdditionalPaidInCapital_F290E43A7848D57663521CF34609AF75" xlink:to="lab_us-gaap_AdditionalPaidInCapital_F290E43A7848D57663521CF34609AF75" xlink:type="arc" />
    <link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_DB657996DB1A34CE02561CF346095609_terseLabel_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_DB657996DB1A34CE02561CF346095609" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accumulated other comprehensive income (loss)</link:label>
    <link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_DB657996DB1A34CE02561CF346095609_label_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_DB657996DB1A34CE02561CF346095609" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accumulated Other Comprehensive Income (Loss), Net of Tax</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_DB657996DB1A34CE02561CF346095609" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_DB657996DB1A34CE02561CF346095609" xlink:to="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_DB657996DB1A34CE02561CF346095609" xlink:type="arc" />
    <link:label id="lab_us-gaap_StockholdersEquity_B1521A7E55A93FB40C201CF34609C427_totalLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquity_B1521A7E55A93FB40C201CF34609C427" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total stockholders&#8217; equity</link:label>
    <link:label id="lab_us-gaap_StockholdersEquity_B1521A7E55A93FB40C201CF34609C427_label_en-US" xlink:label="lab_us-gaap_StockholdersEquity_B1521A7E55A93FB40C201CF34609C427" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stockholders' Equity Attributable to Parent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_B1521A7E55A93FB40C201CF34609C427" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockholdersEquity_B1521A7E55A93FB40C201CF34609C427" xlink:to="lab_us-gaap_StockholdersEquity_B1521A7E55A93FB40C201CF34609C427" xlink:type="arc" />
    <link:label id="lab_us-gaap_LiabilitiesAndStockholdersEquity_9113AAFF72C4C44B1E001CF34609D6F8_totalLabel_en-US" xlink:label="lab_us-gaap_LiabilitiesAndStockholdersEquity_9113AAFF72C4C44B1E001CF34609D6F8" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Total liabilities and stockholders&#8217; equity</link:label>
    <link:label id="lab_us-gaap_LiabilitiesAndStockholdersEquity_9113AAFF72C4C44B1E001CF34609D6F8_label_en-US" xlink:label="lab_us-gaap_LiabilitiesAndStockholdersEquity_9113AAFF72C4C44B1E001CF34609D6F8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liabilities and Equity</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_9113AAFF72C4C44B1E001CF34609D6F8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_9113AAFF72C4C44B1E001CF34609D6F8" xlink:to="lab_us-gaap_LiabilitiesAndStockholdersEquity_9113AAFF72C4C44B1E001CF34609D6F8" xlink:type="arc" />
    <link:label id="lab_us-gaap_StatementOfCashFlowsAbstract_3BEDFB91B435431C50271CF345ECDCF3_label_en-US" xlink:label="lab_us-gaap_StatementOfCashFlowsAbstract_3BEDFB91B435431C50271CF345ECDCF3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement of Cash Flows [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementOfCashFlowsAbstract" xlink:label="loc_us-gaap_StatementOfCashFlowsAbstract_3BEDFB91B435431C50271CF345ECDCF3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StatementOfCashFlowsAbstract_3BEDFB91B435431C50271CF345ECDCF3" xlink:to="lab_us-gaap_StatementOfCashFlowsAbstract_3BEDFB91B435431C50271CF345ECDCF3" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_84291BF21801E6E815C61CF345ECB659_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_84291BF21801E6E815C61CF345ECB659" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash flows from operating activities</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_84291BF21801E6E815C61CF345ECB659_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_84291BF21801E6E815C61CF345ECB659" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_84291BF21801E6E815C61CF345ECB659" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_84291BF21801E6E815C61CF345ECB659" xlink:to="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_84291BF21801E6E815C61CF345ECB659" xlink:type="arc" />
    <link:label id="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_C8F722ACC405E5289E871CF345ED9149_verboseLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_C8F722ACC405E5289E871CF345ED9149" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Adjustments to reconcile net loss to net cash used in operating activities:</link:label>
    <link:label id="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_C8F722ACC405E5289E871CF345ED9149_label_en-US" xlink:label="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_C8F722ACC405E5289E871CF345ED9149" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_C8F722ACC405E5289E871CF345ED9149" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_C8F722ACC405E5289E871CF345ED9149" xlink:to="lab_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_C8F722ACC405E5289E871CF345ED9149" xlink:type="arc" />
    <link:label id="lab_us-gaap_Depreciation_3B49AAFDB4142EDAEC0B1CF345EDDB6B_terseLabel_en-US" xlink:label="lab_us-gaap_Depreciation_3B49AAFDB4142EDAEC0B1CF345EDDB6B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Depreciation</link:label>
    <link:label id="lab_us-gaap_Depreciation_3B49AAFDB4142EDAEC0B1CF345EDDB6B_label_en-US" xlink:label="lab_us-gaap_Depreciation_3B49AAFDB4142EDAEC0B1CF345EDDB6B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Depreciation</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_Depreciation" xlink:label="loc_us-gaap_Depreciation_3B49AAFDB4142EDAEC0B1CF345EDDB6B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_Depreciation_3B49AAFDB4142EDAEC0B1CF345EDDB6B" xlink:to="lab_us-gaap_Depreciation_3B49AAFDB4142EDAEC0B1CF345EDDB6B" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueAdjustmentOfWarrants_9F7C4F962330605967371CF345ED1265_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueAdjustmentOfWarrants_9F7C4F962330605967371CF345ED1265" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Change in valuation of warrant liability</link:label>
    <link:label id="lab_us-gaap_FairValueAdjustmentOfWarrants_9F7C4F962330605967371CF345ED1265_label_en-US" xlink:label="lab_us-gaap_FairValueAdjustmentOfWarrants_9F7C4F962330605967371CF345ED1265" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Adjustment of Warrants</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueAdjustmentOfWarrants" xlink:label="loc_us-gaap_FairValueAdjustmentOfWarrants_9F7C4F962330605967371CF345ED1265" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueAdjustmentOfWarrants_9F7C4F962330605967371CF345ED1265" xlink:to="lab_us-gaap_FairValueAdjustmentOfWarrants_9F7C4F962330605967371CF345ED1265" xlink:type="arc" />
    <link:label id="lab_us-gaap_PaidInKindInterest_B219107236DC466207B81CF345ED920A_terseLabel_en-US" xlink:label="lab_us-gaap_PaidInKindInterest_B219107236DC466207B81CF345ED920A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Non-cash interest expense</link:label>
    <link:label id="lab_us-gaap_PaidInKindInterest_B219107236DC466207B81CF345ED920A_label_en-US" xlink:label="lab_us-gaap_PaidInKindInterest_B219107236DC466207B81CF345ED920A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Paid-in-Kind Interest</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaidInKindInterest" xlink:label="loc_us-gaap_PaidInKindInterest_B219107236DC466207B81CF345ED920A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaidInKindInterest_B219107236DC466207B81CF345ED920A" xlink:to="lab_us-gaap_PaidInKindInterest_B219107236DC466207B81CF345ED920A" xlink:type="arc" />
    <link:label id="lab_us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_4C899EA4B3EB429A24DD1CF345EDECA1_negatedLabel_en-US" xlink:label="lab_us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_4C899EA4B3EB429A24DD1CF345EDECA1" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Amortization of premiums on investments</link:label>
    <link:label id="lab_us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_4C899EA4B3EB429A24DD1CF345EDECA1_label_en-US" xlink:label="lab_us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_4C899EA4B3EB429A24DD1CF345EDECA1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accretion (Amortization) of Discounts and Premiums, Investments</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments" xlink:label="loc_us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_4C899EA4B3EB429A24DD1CF345EDECA1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_4C899EA4B3EB429A24DD1CF345EDECA1" xlink:to="lab_us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments_4C899EA4B3EB429A24DD1CF345EDECA1" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensation_10F12E80A685E14D3B8E1CF345ED0A7A_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensation_10F12E80A685E14D3B8E1CF345ED0A7A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share-based compensation expense</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensation_10F12E80A685E14D3B8E1CF345ED0A7A_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensation_10F12E80A685E14D3B8E1CF345ED0A7A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="loc_us-gaap_ShareBasedCompensation_10F12E80A685E14D3B8E1CF345ED0A7A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensation_10F12E80A685E14D3B8E1CF345ED0A7A" xlink:to="lab_us-gaap_ShareBasedCompensation_10F12E80A685E14D3B8E1CF345ED0A7A" xlink:type="arc" />
    <link:label id="lab_us-gaap_DeferredIncomeTaxExpenseBenefit_059FEF031C9E7554FBE11CF345ED4A3E_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredIncomeTaxExpenseBenefit_059FEF031C9E7554FBE11CF345ED4A3E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Benefit for deferred income taxes</link:label>
    <link:label id="lab_us-gaap_DeferredIncomeTaxExpenseBenefit_059FEF031C9E7554FBE11CF345ED4A3E_label_en-US" xlink:label="lab_us-gaap_DeferredIncomeTaxExpenseBenefit_059FEF031C9E7554FBE11CF345ED4A3E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deferred Income Tax Expense (Benefit)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_059FEF031C9E7554FBE11CF345ED4A3E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_059FEF031C9E7554FBE11CF345ED4A3E" xlink:to="lab_us-gaap_DeferredIncomeTaxExpenseBenefit_059FEF031C9E7554FBE11CF345ED4A3E" xlink:type="arc" />
    <link:label id="lab_us-gaap_ForeignCurrencyTransactionGainLossUnrealized_B7FD6CADC5B2AC026DAC1CF345ED126D_negatedLabel_en-US" xlink:label="lab_us-gaap_ForeignCurrencyTransactionGainLossUnrealized_B7FD6CADC5B2AC026DAC1CF345ED126D" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Unrealized foreign currency transaction losses, net</link:label>
    <link:label id="lab_us-gaap_ForeignCurrencyTransactionGainLossUnrealized_B7FD6CADC5B2AC026DAC1CF345ED126D_label_en-US" xlink:label="lab_us-gaap_ForeignCurrencyTransactionGainLossUnrealized_B7FD6CADC5B2AC026DAC1CF345ED126D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Foreign Currency Transaction Gain (Loss), Unrealized</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ForeignCurrencyTransactionGainLossUnrealized" xlink:label="loc_us-gaap_ForeignCurrencyTransactionGainLossUnrealized_B7FD6CADC5B2AC026DAC1CF345ED126D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ForeignCurrencyTransactionGainLossUnrealized_B7FD6CADC5B2AC026DAC1CF345ED126D" xlink:to="lab_us-gaap_ForeignCurrencyTransactionGainLossUnrealized_B7FD6CADC5B2AC026DAC1CF345ED126D" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_98AB12F16F436BFA199F1CF345EDC5DF_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_98AB12F16F436BFA199F1CF345EDC5DF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Changes in operating assets and liabilities:</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_98AB12F16F436BFA199F1CF345EDC5DF_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_98AB12F16F436BFA199F1CF345EDC5DF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Operating Capital [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_98AB12F16F436BFA199F1CF345EDC5DF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_98AB12F16F436BFA199F1CF345EDC5DF" xlink:to="lab_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_98AB12F16F436BFA199F1CF345EDC5DF" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_126CA55D3499F115ACC51CF345EDFEA7_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_126CA55D3499F115ACC51CF345EDFEA7" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Prepaid expenses and other current assets</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_126CA55D3499F115ACC51CF345EDFEA7_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_126CA55D3499F115ACC51CF345EDFEA7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Prepaid Expense and Other Assets</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_126CA55D3499F115ACC51CF345EDFEA7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_126CA55D3499F115ACC51CF345EDFEA7" xlink:to="lab_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_126CA55D3499F115ACC51CF345EDFEA7" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncreaseDecreaseInReceivables_667ED2CF9CAF3C6FEC161CF345EDE076_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInReceivables_667ED2CF9CAF3C6FEC161CF345EDE076" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Trade receivables, net</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInReceivables_667ED2CF9CAF3C6FEC161CF345EDE076_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInReceivables_667ED2CF9CAF3C6FEC161CF345EDE076" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Receivables</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncreaseDecreaseInReceivables" xlink:label="loc_us-gaap_IncreaseDecreaseInReceivables_667ED2CF9CAF3C6FEC161CF345EDE076" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInReceivables_667ED2CF9CAF3C6FEC161CF345EDE076" xlink:to="lab_us-gaap_IncreaseDecreaseInReceivables_667ED2CF9CAF3C6FEC161CF345EDE076" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncreaseDecreaseInDepositOtherAssets_DB29C830440347C3D19E1CF345EE4D55_negatedLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInDepositOtherAssets_DB29C830440347C3D19E1CF345EE4D55" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Deposits and other assets</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInDepositOtherAssets_DB29C830440347C3D19E1CF345EE4D55_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInDepositOtherAssets_DB29C830440347C3D19E1CF345EE4D55" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Deposit Assets</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncreaseDecreaseInDepositOtherAssets" xlink:label="loc_us-gaap_IncreaseDecreaseInDepositOtherAssets_DB29C830440347C3D19E1CF345EE4D55" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInDepositOtherAssets_DB29C830440347C3D19E1CF345EE4D55" xlink:to="lab_us-gaap_IncreaseDecreaseInDepositOtherAssets_DB29C830440347C3D19E1CF345EE4D55" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_C070CC6D373D393060BA1CF345EE3E4C_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_C070CC6D373D393060BA1CF345EE3E4C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accounts payable and accrued expenses</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_C070CC6D373D393060BA1CF345EE3E4C_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_C070CC6D373D393060BA1CF345EE3E4C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Accounts Payable and Accrued Liabilities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_C070CC6D373D393060BA1CF345EE3E4C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_C070CC6D373D393060BA1CF345EE3E4C" xlink:to="lab_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_C070CC6D373D393060BA1CF345EE3E4C" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities_37EE1C28D6C46813B9291CF345EE1883_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities_37EE1C28D6C46813B9291CF345EE1883" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other long-term liabilities</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities_37EE1C28D6C46813B9291CF345EE1883_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities_37EE1C28D6C46813B9291CF345EE1883" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Other Noncurrent Liabilities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities_37EE1C28D6C46813B9291CF345EE1883" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities_37EE1C28D6C46813B9291CF345EE1883" xlink:to="lab_us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities_37EE1C28D6C46813B9291CF345EE1883" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncreaseDecreaseInDeferredRevenue_356476637AB84E86E21E1CF345EEE318_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInDeferredRevenue_356476637AB84E86E21E1CF345EEE318" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Deferred revenue</link:label>
    <link:label id="lab_us-gaap_IncreaseDecreaseInDeferredRevenue_356476637AB84E86E21E1CF345EEE318_label_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInDeferredRevenue_356476637AB84E86E21E1CF345EEE318" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Increase (Decrease) in Deferred Revenue</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncreaseDecreaseInDeferredRevenue" xlink:label="loc_us-gaap_IncreaseDecreaseInDeferredRevenue_356476637AB84E86E21E1CF345EEE318" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncreaseDecreaseInDeferredRevenue_356476637AB84E86E21E1CF345EEE318" xlink:to="lab_us-gaap_IncreaseDecreaseInDeferredRevenue_356476637AB84E86E21E1CF345EEE318" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_3BB9D6DE602D1D7FCCEC1CF345EEEFE0_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_3BB9D6DE602D1D7FCCEC1CF345EEEFE0" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash used in operating activities</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_3BB9D6DE602D1D7FCCEC1CF345EEEFE0_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_3BB9D6DE602D1D7FCCEC1CF345EEEFE0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Operating Activities, Continuing Operations</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_3BB9D6DE602D1D7FCCEC1CF345EEEFE0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_3BB9D6DE602D1D7FCCEC1CF345EEEFE0" xlink:to="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_3BB9D6DE602D1D7FCCEC1CF345EEEFE0" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract_3AEECB1D72B2AA3E33E41CF345EE7B77_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract_3AEECB1D72B2AA3E33E41CF345EE7B77" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash flows from investing activities</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract_3AEECB1D72B2AA3E33E41CF345EE7B77_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract_3AEECB1D72B2AA3E33E41CF345EE7B77" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract_3AEECB1D72B2AA3E33E41CF345EE7B77" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract_3AEECB1D72B2AA3E33E41CF345EE7B77" xlink:to="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract_3AEECB1D72B2AA3E33E41CF345EE7B77" xlink:type="arc" />
    <link:label id="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_B0181C1020AF6741E6521CF345EE4539_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_B0181C1020AF6741E6521CF345EE4539" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Purchases of fixed assets</link:label>
    <link:label id="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_B0181C1020AF6741E6521CF345EE4539_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_B0181C1020AF6741E6521CF345EE4539" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments to Acquire Property, Plant, and Equipment</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_B0181C1020AF6741E6521CF345EE4539" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_B0181C1020AF6741E6521CF345EE4539" xlink:to="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_B0181C1020AF6741E6521CF345EE4539" xlink:type="arc" />
    <link:label id="lab_us-gaap_PaymentsToAcquireMarketableSecurities_9E62A521456FAF2BF52A1CF345EE4B11_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireMarketableSecurities_9E62A521456FAF2BF52A1CF345EE4B11" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Purchases of marketable securities</link:label>
    <link:label id="lab_us-gaap_PaymentsToAcquireMarketableSecurities_9E62A521456FAF2BF52A1CF345EE4B11_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireMarketableSecurities_9E62A521456FAF2BF52A1CF345EE4B11" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments to Acquire Marketable Securities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsToAcquireMarketableSecurities" xlink:label="loc_us-gaap_PaymentsToAcquireMarketableSecurities_9E62A521456FAF2BF52A1CF345EE4B11" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsToAcquireMarketableSecurities_9E62A521456FAF2BF52A1CF345EE4B11" xlink:to="lab_us-gaap_PaymentsToAcquireMarketableSecurities_9E62A521456FAF2BF52A1CF345EE4B11" xlink:type="arc" />
    <link:label id="lab_us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities_C5111C28C67C6DC9EA741CF345EE5301_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities_C5111C28C67C6DC9EA741CF345EE5301" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Sale and redemption of marketable securities</link:label>
    <link:label id="lab_us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities_C5111C28C67C6DC9EA741CF345EE5301_label_en-US" xlink:label="lab_us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities_C5111C28C67C6DC9EA741CF345EE5301" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from Sale and Maturity of Marketable Securities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities" xlink:label="loc_us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities_C5111C28C67C6DC9EA741CF345EE5301" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities_C5111C28C67C6DC9EA741CF345EE5301" xlink:to="lab_us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities_C5111C28C67C6DC9EA741CF345EE5301" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_091CF8F9F500C3BC4A3E1CF345EF7153_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_091CF8F9F500C3BC4A3E1CF345EF7153" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash provided by investing activities</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_091CF8F9F500C3BC4A3E1CF345EF7153_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_091CF8F9F500C3BC4A3E1CF345EF7153" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Investing Activities, Continuing Operations</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_091CF8F9F500C3BC4A3E1CF345EF7153" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_091CF8F9F500C3BC4A3E1CF345EF7153" xlink:to="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_091CF8F9F500C3BC4A3E1CF345EF7153" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract_E18A0A7A7C155739F4EC1CF345EF6EF6_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract_E18A0A7A7C155739F4EC1CF345EF6EF6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash flows from financing activities</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract_E18A0A7A7C155739F4EC1CF345EF6EF6_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract_E18A0A7A7C155739F4EC1CF345EF6EF6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract_E18A0A7A7C155739F4EC1CF345EF6EF6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract_E18A0A7A7C155739F4EC1CF345EF6EF6" xlink:to="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract_E18A0A7A7C155739F4EC1CF345EF6EF6" xlink:type="arc" />
    <link:label id="lab_us-gaap_ProceedsFromStockOptionsExercised_B90F01891DF93F61EED61CF345EF45C5_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromStockOptionsExercised_B90F01891DF93F61EED61CF345EF45C5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from exercise of options</link:label>
    <link:label id="lab_us-gaap_ProceedsFromStockOptionsExercised_B90F01891DF93F61EED61CF345EF45C5_label_en-US" xlink:label="lab_us-gaap_ProceedsFromStockOptionsExercised_B90F01891DF93F61EED61CF345EF45C5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from Stock Options Exercised</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProceedsFromStockOptionsExercised" xlink:label="loc_us-gaap_ProceedsFromStockOptionsExercised_B90F01891DF93F61EED61CF345EF45C5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromStockOptionsExercised_B90F01891DF93F61EED61CF345EF45C5" xlink:to="lab_us-gaap_ProceedsFromStockOptionsExercised_B90F01891DF93F61EED61CF345EF45C5" xlink:type="arc" />
    <link:label id="lab_us-gaap_PaymentsOfDebtIssuanceCosts_D29D66898C571DBDD2A01CF345EF51F6_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsOfDebtIssuanceCosts_D29D66898C571DBDD2A01CF345EF51F6" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Debt issuance costs related to convertible notes</link:label>
    <link:label id="lab_us-gaap_PaymentsOfDebtIssuanceCosts_D29D66898C571DBDD2A01CF345EF51F6_label_en-US" xlink:label="lab_us-gaap_PaymentsOfDebtIssuanceCosts_D29D66898C571DBDD2A01CF345EF51F6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments of Debt Issuance Costs</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PaymentsOfDebtIssuanceCosts" xlink:label="loc_us-gaap_PaymentsOfDebtIssuanceCosts_D29D66898C571DBDD2A01CF345EF51F6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsOfDebtIssuanceCosts_D29D66898C571DBDD2A01CF345EF51F6" xlink:to="lab_us-gaap_PaymentsOfDebtIssuanceCosts_D29D66898C571DBDD2A01CF345EF51F6" xlink:type="arc" />
    <link:label id="lab_us-gaap_ProceedsFromConvertibleDebt_2E720B9CB698B81D85C21CF345EFB651_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromConvertibleDebt_2E720B9CB698B81D85C21CF345EFB651" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from issuance of convertible notes</link:label>
    <link:label id="lab_us-gaap_ProceedsFromConvertibleDebt_2E720B9CB698B81D85C21CF345EFB651_label_en-US" xlink:label="lab_us-gaap_ProceedsFromConvertibleDebt_2E720B9CB698B81D85C21CF345EFB651" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from Convertible Debt</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ProceedsFromConvertibleDebt" xlink:label="loc_us-gaap_ProceedsFromConvertibleDebt_2E720B9CB698B81D85C21CF345EFB651" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromConvertibleDebt_2E720B9CB698B81D85C21CF345EFB651" xlink:to="lab_us-gaap_ProceedsFromConvertibleDebt_2E720B9CB698B81D85C21CF345EFB651" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_D0961E6423A2C65A7E531CF345EF03CC_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_D0961E6423A2C65A7E531CF345EF03CC" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash provided by financing activities</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_D0961E6423A2C65A7E531CF345EF03CC_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_D0961E6423A2C65A7E531CF345EF03CC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Financing Activities, Continuing Operations</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_D0961E6423A2C65A7E531CF345EF03CC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_D0961E6423A2C65A7E531CF345EF03CC" xlink:to="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations_D0961E6423A2C65A7E531CF345EF03CC" xlink:type="arc" />
    <link:label id="lab_us-gaap_EffectOfExchangeRateOnCashContinuingOperations_EBB1FDB9C61DDF8F19F01CF345EF158F_terseLabel_en-US" xlink:label="lab_us-gaap_EffectOfExchangeRateOnCashContinuingOperations_EBB1FDB9C61DDF8F19F01CF345EF158F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Effect of exchange rate changes on cash</link:label>
    <link:label id="lab_us-gaap_EffectOfExchangeRateOnCashContinuingOperations_EBB1FDB9C61DDF8F19F01CF345EF158F_label_en-US" xlink:label="lab_us-gaap_EffectOfExchangeRateOnCashContinuingOperations_EBB1FDB9C61DDF8F19F01CF345EF158F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Effect of Exchange Rate on Cash, Continuing Operations</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EffectOfExchangeRateOnCashContinuingOperations" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashContinuingOperations_EBB1FDB9C61DDF8F19F01CF345EF158F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EffectOfExchangeRateOnCashContinuingOperations_EBB1FDB9C61DDF8F19F01CF345EF158F" xlink:to="lab_us-gaap_EffectOfExchangeRateOnCashContinuingOperations_EBB1FDB9C61DDF8F19F01CF345EF158F" xlink:type="arc" />
    <link:label id="lab_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_456A98CC4A3858903CDC1CF345EF1497_totalLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_456A98CC4A3858903CDC1CF345EF1497" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net (decrease) increase in cash and cash equivalents</link:label>
    <link:label id="lab_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_456A98CC4A3858903CDC1CF345EF1497_label_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_456A98CC4A3858903CDC1CF345EF1497" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash and Cash Equivalents, Period Increase (Decrease)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease" xlink:label="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_456A98CC4A3858903CDC1CF345EF1497" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_456A98CC4A3858903CDC1CF345EF1497" xlink:to="lab_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_456A98CC4A3858903CDC1CF345EF1497" xlink:type="arc" />
    <link:label id="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_7BE401266E1040F2DE841CF345EFA041_periodStartLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_7BE401266E1040F2DE841CF345EFA041" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Cash and cash equivalents, beginning of period</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_7BE401266E1040F2DE841CF345EFA041" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_7BE401266E1040F2DE841CF345EFA041" xlink:to="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_7BE401266E1040F2DE841CF345EFA041" xlink:type="arc" />
    <link:label id="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_AE29417C42827B0894DF1CF345EFB513_periodEndLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_AE29417C42827B0894DF1CF345EFB513" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Cash and cash equivalents, end of period</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_AE29417C42827B0894DF1CF345EFB513" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_AE29417C42827B0894DF1CF345EFB513" xlink:to="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_AE29417C42827B0894DF1CF345EFB513" xlink:type="arc" />
    <link:label id="lab_us-gaap_SupplementalCashFlowInformationAbstract_86E8DD5BB78EBA486B0E1CF345EFFF1F_terseLabel_en-US" xlink:label="lab_us-gaap_SupplementalCashFlowInformationAbstract_86E8DD5BB78EBA486B0E1CF345EFFF1F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Supplemental disclosure of cash information</link:label>
    <link:label id="lab_us-gaap_SupplementalCashFlowInformationAbstract_86E8DD5BB78EBA486B0E1CF345EFFF1F_label_en-US" xlink:label="lab_us-gaap_SupplementalCashFlowInformationAbstract_86E8DD5BB78EBA486B0E1CF345EFFF1F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Supplemental Cash Flow Information [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SupplementalCashFlowInformationAbstract" xlink:label="loc_us-gaap_SupplementalCashFlowInformationAbstract_86E8DD5BB78EBA486B0E1CF345EFFF1F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_86E8DD5BB78EBA486B0E1CF345EFFF1F" xlink:to="lab_us-gaap_SupplementalCashFlowInformationAbstract_86E8DD5BB78EBA486B0E1CF345EFFF1F" xlink:type="arc" />
    <link:label id="lab_us-gaap_InterestPaid_DE6F78F4E266638C3E551CF345EFFA3A_terseLabel_en-US" xlink:label="lab_us-gaap_InterestPaid_DE6F78F4E266638C3E551CF345EFFA3A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash paid for interest</link:label>
    <link:label id="lab_us-gaap_InterestPaid_DE6F78F4E266638C3E551CF345EFFA3A_label_en-US" xlink:label="lab_us-gaap_InterestPaid_DE6F78F4E266638C3E551CF345EFFA3A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Paid</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InterestPaid" xlink:label="loc_us-gaap_InterestPaid_DE6F78F4E266638C3E551CF345EFFA3A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InterestPaid_DE6F78F4E266638C3E551CF345EFFA3A" xlink:to="lab_us-gaap_InterestPaid_DE6F78F4E266638C3E551CF345EFFA3A" xlink:type="arc" />
    <link:label id="lab_us-gaap_IncomeTaxesPaidNet_DA904355A1B827EA8CFB1CF345F0CCC5_terseLabel_en-US" xlink:label="lab_us-gaap_IncomeTaxesPaidNet_DA904355A1B827EA8CFB1CF345F0CCC5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash paid for income taxes</link:label>
    <link:label id="lab_us-gaap_IncomeTaxesPaidNet_DA904355A1B827EA8CFB1CF345F0CCC5_label_en-US" xlink:label="lab_us-gaap_IncomeTaxesPaidNet_DA904355A1B827EA8CFB1CF345F0CCC5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Income Taxes Paid, Net</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_IncomeTaxesPaidNet" xlink:label="loc_us-gaap_IncomeTaxesPaidNet_DA904355A1B827EA8CFB1CF345F0CCC5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_IncomeTaxesPaidNet_DA904355A1B827EA8CFB1CF345F0CCC5" xlink:to="lab_us-gaap_IncomeTaxesPaidNet_DA904355A1B827EA8CFB1CF345F0CCC5" xlink:type="arc" />
    <link:label id="lab_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_9ADA7853A5CE19327AD71CF345F01A54_terseLabel_en-US" xlink:label="lab_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_9ADA7853A5CE19327AD71CF345F01A54" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Supplemental disclosures of non-cash information related to investing and financing activities</link:label>
    <link:label id="lab_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_9ADA7853A5CE19327AD71CF345F01A54_label_en-US" xlink:label="lab_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_9ADA7853A5CE19327AD71CF345F01A54" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract" xlink:label="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_9ADA7853A5CE19327AD71CF345F01A54" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_9ADA7853A5CE19327AD71CF345F01A54" xlink:to="lab_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_9ADA7853A5CE19327AD71CF345F01A54" xlink:type="arc" />
    <link:label id="lab_ptct_ChangeInUnrealizedGainLossOnMarketableSecurities_AB007C5005AC04B8A9611CF345F0D3FB_terseLabel_en-US" xlink:label="lab_ptct_ChangeInUnrealizedGainLossOnMarketableSecurities_AB007C5005AC04B8A9611CF345F0D3FB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Change in unrealized gain (loss) on marketable securities, net of tax</link:label>
    <link:label id="lab_ptct_ChangeInUnrealizedGainLossOnMarketableSecurities_AB007C5005AC04B8A9611CF345F0D3FB_label_en-US" xlink:label="lab_ptct_ChangeInUnrealizedGainLossOnMarketableSecurities_AB007C5005AC04B8A9611CF345F0D3FB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Change in Unrealized Gain (Loss) on Marketable Securities</link:label>
    <link:label id="lab_ptct_ChangeInUnrealizedGainLossOnMarketableSecurities_AB007C5005AC04B8A9611CF345F0D3FB_documentation_en-US" xlink:label="lab_ptct_ChangeInUnrealizedGainLossOnMarketableSecurities_AB007C5005AC04B8A9611CF345F0D3FB" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents change in the unrealized gain (loss) on marketable securities in noncash investing and financing activities.</link:label>
    <link:loc xlink:href="ptct-20160930.xsd#ptct_ChangeInUnrealizedGainLossOnMarketableSecurities" xlink:label="loc_ptct_ChangeInUnrealizedGainLossOnMarketableSecurities_AB007C5005AC04B8A9611CF345F0D3FB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_ChangeInUnrealizedGainLossOnMarketableSecurities_AB007C5005AC04B8A9611CF345F0D3FB" xlink:to="lab_ptct_ChangeInUnrealizedGainLossOnMarketableSecurities_AB007C5005AC04B8A9611CF345F0D3FB" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueDisclosuresTextBlock_9724C609B360241924826D888E7E6B21_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueDisclosuresTextBlock_9724C609B360241924826D888E7E6B21" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair value of financial instruments and marketable securities</link:label>
    <link:label id="lab_us-gaap_FairValueDisclosuresTextBlock_9724C609B360241924826D888E7E6B21_label_en-US" xlink:label="lab_us-gaap_FairValueDisclosuresTextBlock_9724C609B360241924826D888E7E6B21" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Disclosures [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueDisclosuresTextBlock" xlink:label="loc_us-gaap_FairValueDisclosuresTextBlock_9724C609B360241924826D888E7E6B21" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueDisclosuresTextBlock_9724C609B360241924826D888E7E6B21" xlink:to="lab_us-gaap_FairValueDisclosuresTextBlock_9724C609B360241924826D888E7E6B21" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_5177AAD58AA59811AE591B7637450DF9_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_5177AAD58AA59811AE591B7637450DF9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table]</link:label>
    <link:label id="lab_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_5177AAD58AA59811AE591B7637450DF9_label_en-US" xlink:label="lab_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_5177AAD58AA59811AE591B7637450DF9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_5177AAD58AA59811AE591B7637450DF9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_5177AAD58AA59811AE591B7637450DF9" xlink:to="lab_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_5177AAD58AA59811AE591B7637450DF9" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueByLiabilityClassAxis_7B995E11F4238A2E36991B76374A6E0A_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueByLiabilityClassAxis_7B995E11F4238A2E36991B76374A6E0A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Liability Class [Axis]</link:label>
    <link:label id="lab_us-gaap_FairValueByLiabilityClassAxis_7B995E11F4238A2E36991B76374A6E0A_label_en-US" xlink:label="lab_us-gaap_FairValueByLiabilityClassAxis_7B995E11F4238A2E36991B76374A6E0A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Liability Class [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueByLiabilityClassAxis" xlink:label="loc_us-gaap_FairValueByLiabilityClassAxis_7B995E11F4238A2E36991B76374A6E0A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_7B995E11F4238A2E36991B76374A6E0A" xlink:to="lab_us-gaap_FairValueByLiabilityClassAxis_7B995E11F4238A2E36991B76374A6E0A" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_E031B66F17F5DBAF1C7B1B76374BF24A_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_E031B66F17F5DBAF1C7B1B76374BF24A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair Value by Liability Class [Domain]</link:label>
    <link:label id="lab_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_E031B66F17F5DBAF1C7B1B76374BF24A_label_en-US" xlink:label="lab_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_E031B66F17F5DBAF1C7B1B76374BF24A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value by Liability Class [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_E031B66F17F5DBAF1C7B1B76374BF24A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_E031B66F17F5DBAF1C7B1B76374BF24A" xlink:to="lab_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_E031B66F17F5DBAF1C7B1B76374BF24A" xlink:type="arc" />
    <link:label id="lab_us-gaap_StockAppreciationRightsSARSMember_731AFBBC05BB256AC3F91B76374CDC4F_terseLabel_en-US" xlink:label="lab_us-gaap_StockAppreciationRightsSARSMember_731AFBBC05BB256AC3F91B76374CDC4F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">SARs</link:label>
    <link:label id="lab_us-gaap_StockAppreciationRightsSARSMember_731AFBBC05BB256AC3F91B76374CDC4F_label_en-US" xlink:label="lab_us-gaap_StockAppreciationRightsSARSMember_731AFBBC05BB256AC3F91B76374CDC4F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stock Appreciation Rights (SARs) [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockAppreciationRightsSARSMember" xlink:label="loc_us-gaap_StockAppreciationRightsSARSMember_731AFBBC05BB256AC3F91B76374CDC4F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockAppreciationRightsSARSMember_731AFBBC05BB256AC3F91B76374CDC4F" xlink:to="lab_us-gaap_StockAppreciationRightsSARSMember_731AFBBC05BB256AC3F91B76374CDC4F" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_E844D888F3631B7B10B11B76374CE221_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_E844D888F3631B7B10B11B76374CE221" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair value of warrant liability</link:label>
    <link:label id="lab_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_E844D888F3631B7B10B11B76374CE221_label_en-US" xlink:label="lab_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_E844D888F3631B7B10B11B76374CE221" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_E844D888F3631B7B10B11B76374CE221" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_E844D888F3631B7B10B11B76374CE221" xlink:to="lab_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_E844D888F3631B7B10B11B76374CE221" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_A3409079C7F971D130221B76374CE1D8_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_A3409079C7F971D130221B76374CE1D8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Changes in the fair value of warrant liability and SARs liability</link:label>
    <link:label id="lab_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_A3409079C7F971D130221B76374CE1D8_label_en-US" xlink:label="lab_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_A3409079C7F971D130221B76374CE1D8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_A3409079C7F971D130221B76374CE1D8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_A3409079C7F971D130221B76374CE1D8" xlink:to="lab_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_A3409079C7F971D130221B76374CE1D8" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_E59E373F859BE18A20661B76374C98CB_periodStartLabel_en-US" xlink:label="lab_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_E59E373F859BE18A20661B76374C98CB" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">December 31, 2015</link:label>
    <link:label id="lab_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_E59E373F859BE18A20661B76374C98CB_label_en-US" xlink:label="lab_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_E59E373F859BE18A20661B76374C98CB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_E59E373F859BE18A20661B76374C98CB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_E59E373F859BE18A20661B76374C98CB" xlink:to="lab_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_E59E373F859BE18A20661B76374C98CB" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_D7DA475E86246066EF7B1B76374C11AF_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_D7DA475E86246066EF7B1B76374C11AF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Change in fair value</link:label>
    <link:label id="lab_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_D7DA475E86246066EF7B1B76374C11AF_label_en-US" xlink:label="lab_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_D7DA475E86246066EF7B1B76374C11AF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_D7DA475E86246066EF7B1B76374C11AF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_D7DA475E86246066EF7B1B76374C11AF" xlink:to="lab_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_D7DA475E86246066EF7B1B76374C11AF" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_C2889AD27DB69EB750171B76374C297C_periodEndLabel_en-US" xlink:label="lab_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_C2889AD27DB69EB750171B76374C297C" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">September 30, 2016</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_C2889AD27DB69EB750171B76374C297C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_C2889AD27DB69EB750171B76374C297C" xlink:to="lab_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_C2889AD27DB69EB750171B76374C297C" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueAssumptionsAndMethodologyForAssetsAndLiabilitiesAbstract_53ADC4E58D2C99C4ADB21B76374C6DE4_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueAssumptionsAndMethodologyForAssetsAndLiabilitiesAbstract_53ADC4E58D2C99C4ADB21B76374C6DE4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Assumption used to estimate the fair value of warrant liability and SARs liability by utilizing the Black-Scholes option-pricing model</link:label>
    <link:label id="lab_us-gaap_FairValueAssumptionsAndMethodologyForAssetsAndLiabilitiesAbstract_53ADC4E58D2C99C4ADB21B76374C6DE4_label_en-US" xlink:label="lab_us-gaap_FairValueAssumptionsAndMethodologyForAssetsAndLiabilitiesAbstract_53ADC4E58D2C99C4ADB21B76374C6DE4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Assumptions and Methodology for Assets and Liabilities [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueAssumptionsAndMethodologyForAssetsAndLiabilitiesAbstract" xlink:label="loc_us-gaap_FairValueAssumptionsAndMethodologyForAssetsAndLiabilitiesAbstract_53ADC4E58D2C99C4ADB21B76374C6DE4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueAssumptionsAndMethodologyForAssetsAndLiabilitiesAbstract_53ADC4E58D2C99C4ADB21B76374C6DE4" xlink:to="lab_us-gaap_FairValueAssumptionsAndMethodologyForAssetsAndLiabilitiesAbstract_53ADC4E58D2C99C4ADB21B76374C6DE4" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueAssumptionsExpectedVolatilityRate_3BF8A7FE7587E9A7594B1B76374C41B7_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueAssumptionsExpectedVolatilityRate_3BF8A7FE7587E9A7594B1B76374C41B7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Volatility (as a percent)</link:label>
    <link:label id="lab_us-gaap_FairValueAssumptionsExpectedVolatilityRate_3BF8A7FE7587E9A7594B1B76374C41B7_label_en-US" xlink:label="lab_us-gaap_FairValueAssumptionsExpectedVolatilityRate_3BF8A7FE7587E9A7594B1B76374C41B7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Assumptions, Expected Volatility Rate</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueAssumptionsExpectedVolatilityRate" xlink:label="loc_us-gaap_FairValueAssumptionsExpectedVolatilityRate_3BF8A7FE7587E9A7594B1B76374C41B7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueAssumptionsExpectedVolatilityRate_3BF8A7FE7587E9A7594B1B76374C41B7" xlink:to="lab_us-gaap_FairValueAssumptionsExpectedVolatilityRate_3BF8A7FE7587E9A7594B1B76374C41B7" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueAssumptionsRiskFreeInterestRate_6ADE083F842CFF335EBB1B76374CA529_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueAssumptionsRiskFreeInterestRate_6ADE083F842CFF335EBB1B76374CA529" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Risk-free interest rate (as a percent)</link:label>
    <link:label id="lab_us-gaap_FairValueAssumptionsRiskFreeInterestRate_6ADE083F842CFF335EBB1B76374CA529_label_en-US" xlink:label="lab_us-gaap_FairValueAssumptionsRiskFreeInterestRate_6ADE083F842CFF335EBB1B76374CA529" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Assumptions, Risk Free Interest Rate</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueAssumptionsRiskFreeInterestRate" xlink:label="loc_us-gaap_FairValueAssumptionsRiskFreeInterestRate_6ADE083F842CFF335EBB1B76374CA529" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueAssumptionsRiskFreeInterestRate_6ADE083F842CFF335EBB1B76374CA529" xlink:to="lab_us-gaap_FairValueAssumptionsRiskFreeInterestRate_6ADE083F842CFF335EBB1B76374CA529" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueAssumptionsExercisePrice_753FC100F849E155FC371B76374C9CA6_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueAssumptionsExercisePrice_753FC100F849E155FC371B76374C9CA6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Strike price (in dollars per share)</link:label>
    <link:label id="lab_us-gaap_FairValueAssumptionsExercisePrice_753FC100F849E155FC371B76374C9CA6_label_en-US" xlink:label="lab_us-gaap_FairValueAssumptionsExercisePrice_753FC100F849E155FC371B76374C9CA6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Assumptions, Exercise Price</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueAssumptionsExercisePrice" xlink:label="loc_us-gaap_FairValueAssumptionsExercisePrice_753FC100F849E155FC371B76374C9CA6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueAssumptionsExercisePrice_753FC100F849E155FC371B76374C9CA6" xlink:to="lab_us-gaap_FairValueAssumptionsExercisePrice_753FC100F849E155FC371B76374C9CA6" xlink:type="arc" />
    <link:label id="lab_us-gaap_SharePrice_A7941D7E6EAEAFED332D1B76374C1D42_terseLabel_en-US" xlink:label="lab_us-gaap_SharePrice_A7941D7E6EAEAFED332D1B76374C1D42" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Fair value of shares (in dollars per share)</link:label>
    <link:label id="lab_us-gaap_SharePrice_A7941D7E6EAEAFED332D1B76374C1D42_label_en-US" xlink:label="lab_us-gaap_SharePrice_A7941D7E6EAEAFED332D1B76374C1D42" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share Price</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SharePrice" xlink:label="loc_us-gaap_SharePrice_A7941D7E6EAEAFED332D1B76374C1D42" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SharePrice_A7941D7E6EAEAFED332D1B76374C1D42" xlink:to="lab_us-gaap_SharePrice_A7941D7E6EAEAFED332D1B76374C1D42" xlink:type="arc" />
    <link:label id="lab_us-gaap_FairValueAssumptionsExpectedTerm_9A97785A463D3D45E5B31B763752F00C_terseLabel_en-US" xlink:label="lab_us-gaap_FairValueAssumptionsExpectedTerm_9A97785A463D3D45E5B31B763752F00C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Expected life</link:label>
    <link:label id="lab_us-gaap_FairValueAssumptionsExpectedTerm_9A97785A463D3D45E5B31B763752F00C_label_en-US" xlink:label="lab_us-gaap_FairValueAssumptionsExpectedTerm_9A97785A463D3D45E5B31B763752F00C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Fair Value Assumptions, Expected Term</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_FairValueAssumptionsExpectedTerm" xlink:label="loc_us-gaap_FairValueAssumptionsExpectedTerm_9A97785A463D3D45E5B31B763752F00C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_FairValueAssumptionsExpectedTerm_9A97785A463D3D45E5B31B763752F00C" xlink:to="lab_us-gaap_FairValueAssumptionsExpectedTerm_9A97785A463D3D45E5B31B763752F00C" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfAccountsPayableAndAccruedLiabilitiesTableTextBlock_94ADFD46F2D3E9CF01536D888E46B555_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfAccountsPayableAndAccruedLiabilitiesTableTextBlock_94ADFD46F2D3E9CF01536D888E46B555" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of components of accounts payable and accrued expenses</link:label>
    <link:label id="lab_us-gaap_ScheduleOfAccountsPayableAndAccruedLiabilitiesTableTextBlock_94ADFD46F2D3E9CF01536D888E46B555_label_en-US" xlink:label="lab_us-gaap_ScheduleOfAccountsPayableAndAccruedLiabilitiesTableTextBlock_94ADFD46F2D3E9CF01536D888E46B555" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfAccountsPayableAndAccruedLiabilitiesTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfAccountsPayableAndAccruedLiabilitiesTableTextBlock_94ADFD46F2D3E9CF01536D888E46B555" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfAccountsPayableAndAccruedLiabilitiesTableTextBlock_94ADFD46F2D3E9CF01536D888E46B555" xlink:to="lab_us-gaap_ScheduleOfAccountsPayableAndAccruedLiabilitiesTableTextBlock_94ADFD46F2D3E9CF01536D888E46B555" xlink:type="arc" />
    <link:label id="lab_us-gaap_LongTermDebtTextBlock_AEF4A2164D54B0E469446D888E7FA2B8_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtTextBlock_AEF4A2164D54B0E469446D888E7FA2B8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Convertible Senior Notes</link:label>
    <link:label id="lab_us-gaap_LongTermDebtTextBlock_AEF4A2164D54B0E469446D888E7FA2B8_label_en-US" xlink:label="lab_us-gaap_LongTermDebtTextBlock_AEF4A2164D54B0E469446D888E7FA2B8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongTermDebtTextBlock" xlink:label="loc_us-gaap_LongTermDebtTextBlock_AEF4A2164D54B0E469446D888E7FA2B8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongTermDebtTextBlock_AEF4A2164D54B0E469446D888E7FA2B8" xlink:to="lab_us-gaap_LongTermDebtTextBlock_AEF4A2164D54B0E469446D888E7FA2B8" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_9314C7BEDB073763E06F6D888EC62356_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_9314C7BEDB073763E06F6D888EC62356" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of computation of basic and diluted net loss available to common stockholders</link:label>
    <link:label id="lab_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_9314C7BEDB073763E06F6D888EC62356_label_en-US" xlink:label="lab_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_9314C7BEDB073763E06F6D888EC62356" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock" xlink:label="loc_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_9314C7BEDB073763E06F6D888EC62356" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_9314C7BEDB073763E06F6D888EC62356" xlink:to="lab_us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock_9314C7BEDB073763E06F6D888EC62356" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock_BC282443694CC90003CA6D888EC6B6AB_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock_BC282443694CC90003CA6D888EC6B6AB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of historical dilutive common share equivalents outstanding</link:label>
    <link:label id="lab_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock_BC282443694CC90003CA6D888EC6B6AB_label_en-US" xlink:label="lab_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock_BC282443694CC90003CA6D888EC6B6AB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock_BC282443694CC90003CA6D888EC6B6AB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock_BC282443694CC90003CA6D888EC6B6AB" xlink:to="lab_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock_BC282443694CC90003CA6D888EC6B6AB" xlink:type="arc" />
    <link:label id="lab_us-gaap_RestrictedStockMember_198BC59836ACFEE4A8E2E8F9D8C7C76A_terseLabel_en-US" xlink:label="lab_us-gaap_RestrictedStockMember_198BC59836ACFEE4A8E2E8F9D8C7C76A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unvested restricted stock</link:label>
    <link:label id="lab_us-gaap_RestrictedStockMember_198BC59836ACFEE4A8E2E8F9D8C7C76A_label_en-US" xlink:label="lab_us-gaap_RestrictedStockMember_198BC59836ACFEE4A8E2E8F9D8C7C76A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Restricted Stock [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RestrictedStockMember" xlink:label="loc_us-gaap_RestrictedStockMember_198BC59836ACFEE4A8E2E8F9D8C7C76A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RestrictedStockMember_198BC59836ACFEE4A8E2E8F9D8C7C76A" xlink:to="lab_us-gaap_RestrictedStockMember_198BC59836ACFEE4A8E2E8F9D8C7C76A" xlink:type="arc" />
    <link:label id="lab_us-gaap_ResearchAndDevelopmentExpenseMember_542545A807D0038998D7E8F9D8C7030E_terseLabel_en-US" xlink:label="lab_us-gaap_ResearchAndDevelopmentExpenseMember_542545A807D0038998D7E8F9D8C7030E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Research and development</link:label>
    <link:label id="lab_us-gaap_ResearchAndDevelopmentExpenseMember_542545A807D0038998D7E8F9D8C7030E_label_en-US" xlink:label="lab_us-gaap_ResearchAndDevelopmentExpenseMember_542545A807D0038998D7E8F9D8C7030E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Research and Development Expense [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ResearchAndDevelopmentExpenseMember" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpenseMember_542545A807D0038998D7E8F9D8C7030E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ResearchAndDevelopmentExpenseMember_542545A807D0038998D7E8F9D8C7030E" xlink:to="lab_us-gaap_ResearchAndDevelopmentExpenseMember_542545A807D0038998D7E8F9D8C7030E" xlink:type="arc" />
    <link:label id="lab_us-gaap_SellingGeneralAndAdministrativeExpensesMember_55D71DA8F98FC67B6E48E8F9D8C798A5_terseLabel_en-US" xlink:label="lab_us-gaap_SellingGeneralAndAdministrativeExpensesMember_55D71DA8F98FC67B6E48E8F9D8C798A5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Selling, general and administrative</link:label>
    <link:label id="lab_us-gaap_SellingGeneralAndAdministrativeExpensesMember_55D71DA8F98FC67B6E48E8F9D8C798A5_label_en-US" xlink:label="lab_us-gaap_SellingGeneralAndAdministrativeExpensesMember_55D71DA8F98FC67B6E48E8F9D8C798A5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Selling, General and Administrative Expenses [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpensesMember" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_55D71DA8F98FC67B6E48E8F9D8C798A5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_55D71DA8F98FC67B6E48E8F9D8C798A5" xlink:to="lab_us-gaap_SellingGeneralAndAdministrativeExpensesMember_55D71DA8F98FC67B6E48E8F9D8C798A5" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_46C1D20D674D919835CCE8F9D8C701EF_verboseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_46C1D20D674D919835CCE8F9D8C701EF" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Restricted Stock Awards and Units</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_46C1D20D674D919835CCE8F9D8C701EF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_46C1D20D674D919835CCE8F9D8C701EF" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_46C1D20D674D919835CCE8F9D8C701EF" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_4476E20AB909494F83E1E8F9D8C780AF_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_4476E20AB909494F83E1E8F9D8C780AF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of Shares</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_4476E20AB909494F83E1E8F9D8C780AF_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_4476E20AB909494F83E1E8F9D8C780AF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_4476E20AB909494F83E1E8F9D8C780AF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_4476E20AB909494F83E1E8F9D8C780AF" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_4476E20AB909494F83E1E8F9D8C780AF" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_C8117F23450F64D7EBF4E8F9D8C7557C_periodStartLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_C8117F23450F64D7EBF4E8F9D8C7557C" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Balance at the beginning of the period (in shares)</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_C8117F23450F64D7EBF4E8F9D8C7557C_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_C8117F23450F64D7EBF4E8F9D8C7557C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_C8117F23450F64D7EBF4E8F9D8C7557C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_C8117F23450F64D7EBF4E8F9D8C7557C" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_C8117F23450F64D7EBF4E8F9D8C7557C" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_0F1614C4C2CD3A0ECAD9E8F9D8CDE592_negatedLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_0F1614C4C2CD3A0ECAD9E8F9D8CDE592" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Vested (in shares)</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_0F1614C4C2CD3A0ECAD9E8F9D8CDE592_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_0F1614C4C2CD3A0ECAD9E8F9D8CDE592" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_0F1614C4C2CD3A0ECAD9E8F9D8CDE592" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_0F1614C4C2CD3A0ECAD9E8F9D8CDE592" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_0F1614C4C2CD3A0ECAD9E8F9D8CDE592" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_6871BDB8AC9804C7C913E8F9D8CD5211_negatedLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_6871BDB8AC9804C7C913E8F9D8CD5211" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Forfeited (in shares)</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_6871BDB8AC9804C7C913E8F9D8CD5211_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_6871BDB8AC9804C7C913E8F9D8CD5211" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_6871BDB8AC9804C7C913E8F9D8CD5211" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_6871BDB8AC9804C7C913E8F9D8CD5211" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_6871BDB8AC9804C7C913E8F9D8CD5211" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_C4BC2FA90A53640E693DE8F9D8CDC8B0_periodEndLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_C4BC2FA90A53640E693DE8F9D8CDC8B0" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Balance at the end of the period (in shares)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_C4BC2FA90A53640E693DE8F9D8CDC8B0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_C4BC2FA90A53640E693DE8F9D8CDC8B0" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_C4BC2FA90A53640E693DE8F9D8CDC8B0" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_581A270C528C84F08563E8F9D8CD0A76_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_581A270C528C84F08563E8F9D8CD0A76" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Weighted Average Grant Date Fair Value</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_581A270C528C84F08563E8F9D8CD0A76_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_581A270C528C84F08563E8F9D8CD0A76" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_581A270C528C84F08563E8F9D8CD0A76" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_581A270C528C84F08563E8F9D8CD0A76" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_581A270C528C84F08563E8F9D8CD0A76" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_2181878F84128ED020E0E8F9D8CDA736_periodStartLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_2181878F84128ED020E0E8F9D8CDA736" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Balance at the beginning of the period (in dollars per share)</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_2181878F84128ED020E0E8F9D8CDA736_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_2181878F84128ED020E0E8F9D8CDA736" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_2181878F84128ED020E0E8F9D8CDA736" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_2181878F84128ED020E0E8F9D8CDA736" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_2181878F84128ED020E0E8F9D8CDA736" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_503434DC6F1B1B63F053E8F9D8CD1BEA_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_503434DC6F1B1B63F053E8F9D8CD1BEA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Granted (in dollars per share)</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_503434DC6F1B1B63F053E8F9D8CD1BEA_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_503434DC6F1B1B63F053E8F9D8CD1BEA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_503434DC6F1B1B63F053E8F9D8CD1BEA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_503434DC6F1B1B63F053E8F9D8CD1BEA" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_503434DC6F1B1B63F053E8F9D8CD1BEA" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_2716E4329D9F27BAF6B4E8F9D8CDCDF5_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_2716E4329D9F27BAF6B4E8F9D8CDCDF5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Vested (in dollars per share)</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_2716E4329D9F27BAF6B4E8F9D8CDCDF5_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_2716E4329D9F27BAF6B4E8F9D8CDCDF5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_2716E4329D9F27BAF6B4E8F9D8CDCDF5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_2716E4329D9F27BAF6B4E8F9D8CDCDF5" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_2716E4329D9F27BAF6B4E8F9D8CDCDF5" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_C5596038665B29C03F47E8F9D8CD83F3_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_C5596038665B29C03F47E8F9D8CD83F3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Forfeited (in dollars per share)</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_C5596038665B29C03F47E8F9D8CD83F3_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_C5596038665B29C03F47E8F9D8CD83F3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_C5596038665B29C03F47E8F9D8CD83F3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_C5596038665B29C03F47E8F9D8CD83F3" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_C5596038665B29C03F47E8F9D8CD83F3" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_AC422FDB93F4AB8D4CB6E8F9D8CD2265_periodEndLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_AC422FDB93F4AB8D4CB6E8F9D8CD2265" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Balance at the end of the period (in dollars per share)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_AC422FDB93F4AB8D4CB6E8F9D8CD2265" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_AC422FDB93F4AB8D4CB6E8F9D8CD2265" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_AC422FDB93F4AB8D4CB6E8F9D8CD2265" xlink:type="arc" />
    <link:label id="lab_us-gaap_AllocatedShareBasedCompensationExpense_6DE7B142FA55977E2CBAE8F9D8CD1E54_terseLabel_en-US" xlink:label="lab_us-gaap_AllocatedShareBasedCompensationExpense_6DE7B142FA55977E2CBAE8F9D8CD1E54" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share-based compensation expense</link:label>
    <link:label id="lab_us-gaap_AllocatedShareBasedCompensationExpense_6DE7B142FA55977E2CBAE8F9D8CD1E54_label_en-US" xlink:label="lab_us-gaap_AllocatedShareBasedCompensationExpense_6DE7B142FA55977E2CBAE8F9D8CD1E54" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Allocated Share-based Compensation Expense</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_6DE7B142FA55977E2CBAE8F9D8CD1E54" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AllocatedShareBasedCompensationExpense_6DE7B142FA55977E2CBAE8F9D8CD1E54" xlink:to="lab_us-gaap_AllocatedShareBasedCompensationExpense_6DE7B142FA55977E2CBAE8F9D8CD1E54" xlink:type="arc" />
    <link:label id="lab_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_47922EAFB417ACDBEBCA6D888E8D521E_terseLabel_en-US" xlink:label="lab_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_47922EAFB417ACDBEBCA6D888E8D521E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Stock award plan</link:label>
    <link:label id="lab_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_47922EAFB417ACDBEBCA6D888E8D521E_label_en-US" xlink:label="lab_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_47922EAFB417ACDBEBCA6D888E8D521E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Disclosure of Compensation Related Costs, Share-based Payments [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock" xlink:label="loc_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_47922EAFB417ACDBEBCA6D888E8D521E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_47922EAFB417ACDBEBCA6D888E8D521E" xlink:to="lab_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_47922EAFB417ACDBEBCA6D888E8D521E" xlink:type="arc" />
    <link:label id="lab_us-gaap_EmployeeRelatedLiabilitiesCurrent_36A61E2E7E6CA92FE2681BB71E000567_terseLabel_en-US" xlink:label="lab_us-gaap_EmployeeRelatedLiabilitiesCurrent_36A61E2E7E6CA92FE2681BB71E000567" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Employee compensation, benefits, and related accruals</link:label>
    <link:label id="lab_us-gaap_EmployeeRelatedLiabilitiesCurrent_36A61E2E7E6CA92FE2681BB71E000567_label_en-US" xlink:label="lab_us-gaap_EmployeeRelatedLiabilitiesCurrent_36A61E2E7E6CA92FE2681BB71E000567" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Employee-related Liabilities, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EmployeeRelatedLiabilitiesCurrent" xlink:label="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_36A61E2E7E6CA92FE2681BB71E000567" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_36A61E2E7E6CA92FE2681BB71E000567" xlink:to="lab_us-gaap_EmployeeRelatedLiabilitiesCurrent_36A61E2E7E6CA92FE2681BB71E000567" xlink:type="arc" />
    <link:label id="lab_ptct_AccruedConsultingAndContractedResearchCurrent_FB730FC55ACC60709C731BB71E00E835_terseLabel_en-US" xlink:label="lab_ptct_AccruedConsultingAndContractedResearchCurrent_FB730FC55ACC60709C731BB71E00E835" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Consulting and contracted research</link:label>
    <link:label id="lab_ptct_AccruedConsultingAndContractedResearchCurrent_FB730FC55ACC60709C731BB71E00E835_label_en-US" xlink:label="lab_ptct_AccruedConsultingAndContractedResearchCurrent_FB730FC55ACC60709C731BB71E00E835" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accrued Consulting and Contracted Research Current</link:label>
    <link:label id="lab_ptct_AccruedConsultingAndContractedResearchCurrent_FB730FC55ACC60709C731BB71E00E835_documentation_en-US" xlink:label="lab_ptct_AccruedConsultingAndContractedResearchCurrent_FB730FC55ACC60709C731BB71E00E835" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the carrying value as of the balance sheet date of obligations incurred through that date and payable for consulting and contracted research.</link:label>
    <link:loc xlink:href="ptct-20160930.xsd#ptct_AccruedConsultingAndContractedResearchCurrent" xlink:label="loc_ptct_AccruedConsultingAndContractedResearchCurrent_FB730FC55ACC60709C731BB71E00E835" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_AccruedConsultingAndContractedResearchCurrent_FB730FC55ACC60709C731BB71E00E835" xlink:to="lab_ptct_AccruedConsultingAndContractedResearchCurrent_FB730FC55ACC60709C731BB71E00E835" xlink:type="arc" />
    <link:label id="lab_us-gaap_AccruedProfessionalFeesCurrent_2D9B339E8BAC1A6183471BB71E00482A_terseLabel_en-US" xlink:label="lab_us-gaap_AccruedProfessionalFeesCurrent_2D9B339E8BAC1A6183471BB71E00482A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Professional fees</link:label>
    <link:label id="lab_us-gaap_AccruedProfessionalFeesCurrent_2D9B339E8BAC1A6183471BB71E00482A_label_en-US" xlink:label="lab_us-gaap_AccruedProfessionalFeesCurrent_2D9B339E8BAC1A6183471BB71E00482A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accrued Professional Fees, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccruedProfessionalFeesCurrent" xlink:label="loc_us-gaap_AccruedProfessionalFeesCurrent_2D9B339E8BAC1A6183471BB71E00482A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccruedProfessionalFeesCurrent_2D9B339E8BAC1A6183471BB71E00482A" xlink:to="lab_us-gaap_AccruedProfessionalFeesCurrent_2D9B339E8BAC1A6183471BB71E00482A" xlink:type="arc" />
    <link:label id="lab_us-gaap_AccountsPayableCurrent_88E145F12EF709880A5A1BB71E0040D4_terseLabel_en-US" xlink:label="lab_us-gaap_AccountsPayableCurrent_88E145F12EF709880A5A1BB71E0040D4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accounts payable</link:label>
    <link:label id="lab_us-gaap_AccountsPayableCurrent_88E145F12EF709880A5A1BB71E0040D4_label_en-US" xlink:label="lab_us-gaap_AccountsPayableCurrent_88E145F12EF709880A5A1BB71E0040D4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accounts Payable, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccountsPayableCurrent" xlink:label="loc_us-gaap_AccountsPayableCurrent_88E145F12EF709880A5A1BB71E0040D4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccountsPayableCurrent_88E145F12EF709880A5A1BB71E0040D4" xlink:to="lab_us-gaap_AccountsPayableCurrent_88E145F12EF709880A5A1BB71E0040D4" xlink:type="arc" />
    <link:label id="lab_ptct_AccruedSeverance_8C21D38A510B60A0DC861BB71E0025D6_terseLabel_en-US" xlink:label="lab_ptct_AccruedSeverance_8C21D38A510B60A0DC861BB71E0025D6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accrued severance</link:label>
    <link:label id="lab_ptct_AccruedSeverance_8C21D38A510B60A0DC861BB71E0025D6_label_en-US" xlink:label="lab_ptct_AccruedSeverance_8C21D38A510B60A0DC861BB71E0025D6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accrued severance</link:label>
    <link:label id="lab_ptct_AccruedSeverance_8C21D38A510B60A0DC861BB71E0025D6_documentation_en-US" xlink:label="lab_ptct_AccruedSeverance_8C21D38A510B60A0DC861BB71E0025D6" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Carrying value as of the balance sheet date of obligations incurred through that date and payable for severance. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).</link:label>
    <link:loc xlink:href="ptct-20160930.xsd#ptct_AccruedSeverance" xlink:label="loc_ptct_AccruedSeverance_8C21D38A510B60A0DC861BB71E0025D6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_AccruedSeverance_8C21D38A510B60A0DC861BB71E0025D6" xlink:to="lab_ptct_AccruedSeverance_8C21D38A510B60A0DC861BB71E0025D6" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherAccruedLiabilitiesCurrent_F19F834B014AFF1B5ABD1BB71E01A142_terseLabel_en-US" xlink:label="lab_us-gaap_OtherAccruedLiabilitiesCurrent_F19F834B014AFF1B5ABD1BB71E01A142" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other</link:label>
    <link:label id="lab_us-gaap_OtherAccruedLiabilitiesCurrent_F19F834B014AFF1B5ABD1BB71E01A142_label_en-US" xlink:label="lab_us-gaap_OtherAccruedLiabilitiesCurrent_F19F834B014AFF1B5ABD1BB71E01A142" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Accrued Liabilities, Current</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherAccruedLiabilitiesCurrent" xlink:label="loc_us-gaap_OtherAccruedLiabilitiesCurrent_F19F834B014AFF1B5ABD1BB71E01A142" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherAccruedLiabilitiesCurrent_F19F834B014AFF1B5ABD1BB71E01A142" xlink:to="lab_us-gaap_OtherAccruedLiabilitiesCurrent_F19F834B014AFF1B5ABD1BB71E01A142" xlink:type="arc" />
    <link:label id="lab_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_04F81ECCD53ACF3175161BB71E018449_totalLabel_en-US" xlink:label="lab_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_04F81ECCD53ACF3175161BB71E018449" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Accounts payable and accrued expenses</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent" xlink:label="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_04F81ECCD53ACF3175161BB71E018449" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_04F81ECCD53ACF3175161BB71E018449" xlink:to="lab_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_04F81ECCD53ACF3175161BB71E018449" xlink:type="arc" />
    <link:label id="lab_us-gaap_ConvertibleDebtTableTextBlock_2F294EE4A6BA30F396906D888E5A8E88_terseLabel_en-US" xlink:label="lab_us-gaap_ConvertibleDebtTableTextBlock_2F294EE4A6BA30F396906D888E5A8E88" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Summary of convertible notes</link:label>
    <link:label id="lab_us-gaap_ConvertibleDebtTableTextBlock_2F294EE4A6BA30F396906D888E5A8E88_label_en-US" xlink:label="lab_us-gaap_ConvertibleDebtTableTextBlock_2F294EE4A6BA30F396906D888E5A8E88" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Convertible Debt [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ConvertibleDebtTableTextBlock" xlink:label="loc_us-gaap_ConvertibleDebtTableTextBlock_2F294EE4A6BA30F396906D888E5A8E88" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ConvertibleDebtTableTextBlock_2F294EE4A6BA30F396906D888E5A8E88" xlink:to="lab_us-gaap_ConvertibleDebtTableTextBlock_2F294EE4A6BA30F396906D888E5A8E88" xlink:type="arc" />
    <link:label id="lab_ptct_ScheduleOfInterestExpenseRecognizedRelatedToConvertibleDebt_BFB68BABEEE2E33790CF6D888E5A18DB_terseLabel_en-US" xlink:label="lab_ptct_ScheduleOfInterestExpenseRecognizedRelatedToConvertibleDebt_BFB68BABEEE2E33790CF6D888E5A18DB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Summary of interest expense recognized related to the Convertible Notes</link:label>
    <link:label id="lab_ptct_ScheduleOfInterestExpenseRecognizedRelatedToConvertibleDebt_BFB68BABEEE2E33790CF6D888E5A18DB_label_en-US" xlink:label="lab_ptct_ScheduleOfInterestExpenseRecognizedRelatedToConvertibleDebt_BFB68BABEEE2E33790CF6D888E5A18DB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule Of Interest Expense Recognized Related To Convertible Debt</link:label>
    <link:label id="lab_ptct_ScheduleOfInterestExpenseRecognizedRelatedToConvertibleDebt_BFB68BABEEE2E33790CF6D888E5A18DB_documentation_en-US" xlink:label="lab_ptct_ScheduleOfInterestExpenseRecognizedRelatedToConvertibleDebt_BFB68BABEEE2E33790CF6D888E5A18DB" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Tabular disclosure of interest expense recognized related to convertible debt.</link:label>
    <link:loc xlink:href="ptct-20160930.xsd#ptct_ScheduleOfInterestExpenseRecognizedRelatedToConvertibleDebt" xlink:label="loc_ptct_ScheduleOfInterestExpenseRecognizedRelatedToConvertibleDebt_BFB68BABEEE2E33790CF6D888E5A18DB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_ScheduleOfInterestExpenseRecognizedRelatedToConvertibleDebt_BFB68BABEEE2E33790CF6D888E5A18DB" xlink:to="lab_ptct_ScheduleOfInterestExpenseRecognizedRelatedToConvertibleDebt_BFB68BABEEE2E33790CF6D888E5A18DB" xlink:type="arc" />
    <link:label id="lab_us-gaap_EarningsPerShareBasicAndDilutedAbstract_206CF47A86483E99E902E35B90485668_terseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareBasicAndDilutedAbstract_206CF47A86483E99E902E35B90485668" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net loss per share</link:label>
    <link:label id="lab_us-gaap_EarningsPerShareBasicAndDilutedAbstract_206CF47A86483E99E902E35B90485668_label_en-US" xlink:label="lab_us-gaap_EarningsPerShareBasicAndDilutedAbstract_206CF47A86483E99E902E35B90485668" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Earnings Per Share, Basic and Diluted [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EarningsPerShareBasicAndDilutedAbstract" xlink:label="loc_us-gaap_EarningsPerShareBasicAndDilutedAbstract_206CF47A86483E99E902E35B90485668" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EarningsPerShareBasicAndDilutedAbstract_206CF47A86483E99E902E35B90485668" xlink:to="lab_us-gaap_EarningsPerShareBasicAndDilutedAbstract_206CF47A86483E99E902E35B90485668" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract_61F72494B6D71A035161E35B9048F96B_terseLabel_en-US" xlink:label="lab_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract_61F72494B6D71A035161E35B9048F96B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Numerator</link:label>
    <link:label id="lab_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract_61F72494B6D71A035161E35B9048F96B_label_en-US" xlink:label="lab_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract_61F72494B6D71A035161E35B9048F96B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Income (Loss) Available to Common Stockholders, Basic [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract_61F72494B6D71A035161E35B9048F96B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract_61F72494B6D71A035161E35B9048F96B" xlink:to="lab_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract_61F72494B6D71A035161E35B9048F96B" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_66678820BD4B3A582BA9E35B90489267_terseLabel_en-US" xlink:label="lab_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_66678820BD4B3A582BA9E35B90489267" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net loss</link:label>
    <link:label id="lab_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_66678820BD4B3A582BA9E35B90489267_label_en-US" xlink:label="lab_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_66678820BD4B3A582BA9E35B90489267" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Income (Loss) Available to Common Stockholders, Basic</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_66678820BD4B3A582BA9E35B90489267" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_66678820BD4B3A582BA9E35B90489267" xlink:to="lab_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_66678820BD4B3A582BA9E35B90489267" xlink:type="arc" />
    <link:label id="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_2F1128213888B4855386E35B90485F68_verboseLabel_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_2F1128213888B4855386E35B90485F68" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Denominator</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_2F1128213888B4855386E35B90485F68" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_2F1128213888B4855386E35B90485F68" xlink:to="lab_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_2F1128213888B4855386E35B90485F68" xlink:type="arc" />
    <link:label id="lab_us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted_2D3E4485092E0A17AD81E35B9048CEA2_terseLabel_en-US" xlink:label="lab_us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted_2D3E4485092E0A17AD81E35B9048CEA2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Denominator for basic and diluted net loss per share (in shares)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted" xlink:label="loc_us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted_2D3E4485092E0A17AD81E35B9048CEA2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted_2D3E4485092E0A17AD81E35B9048CEA2" xlink:to="lab_us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted_2D3E4485092E0A17AD81E35B9048CEA2" xlink:type="arc" />
    <link:label id="lab_us-gaap_EarningsPerShareBasicAndDilutedOtherDisclosuresAbstract_9FDCAC1ACD7ACFB37B02E35B90486B0F_terseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareBasicAndDilutedOtherDisclosuresAbstract_9FDCAC1ACD7ACFB37B02E35B90486B0F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net loss per share:</link:label>
    <link:label id="lab_us-gaap_EarningsPerShareBasicAndDilutedOtherDisclosuresAbstract_9FDCAC1ACD7ACFB37B02E35B90486B0F_label_en-US" xlink:label="lab_us-gaap_EarningsPerShareBasicAndDilutedOtherDisclosuresAbstract_9FDCAC1ACD7ACFB37B02E35B90486B0F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EarningsPerShareBasicAndDilutedOtherDisclosuresAbstract" xlink:label="loc_us-gaap_EarningsPerShareBasicAndDilutedOtherDisclosuresAbstract_9FDCAC1ACD7ACFB37B02E35B90486B0F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EarningsPerShareBasicAndDilutedOtherDisclosuresAbstract_9FDCAC1ACD7ACFB37B02E35B90486B0F" xlink:to="lab_us-gaap_EarningsPerShareBasicAndDilutedOtherDisclosuresAbstract_9FDCAC1ACD7ACFB37B02E35B90486B0F" xlink:type="arc" />
    <link:label id="lab_us-gaap_EarningsPerShareBasicAndDiluted_649DAB1FE8703CF4D72BE35B90487BE7_terseLabel_en-US" xlink:label="lab_us-gaap_EarningsPerShareBasicAndDiluted_649DAB1FE8703CF4D72BE35B90487BE7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Basic and diluted (in dollars per share)</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EarningsPerShareBasicAndDiluted" xlink:label="loc_us-gaap_EarningsPerShareBasicAndDiluted_649DAB1FE8703CF4D72BE35B90487BE7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EarningsPerShareBasicAndDiluted_649DAB1FE8703CF4D72BE35B90487BE7" xlink:to="lab_us-gaap_EarningsPerShareBasicAndDiluted_649DAB1FE8703CF4D72BE35B90487BE7" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_C4AE6F95C5631995BD20E35B9038F15F_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_C4AE6F95C5631995BD20E35B9038F15F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table]</link:label>
    <link:label id="lab_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_C4AE6F95C5631995BD20E35B9038F15F_label_en-US" xlink:label="lab_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_C4AE6F95C5631995BD20E35B9038F15F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_C4AE6F95C5631995BD20E35B9038F15F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_C4AE6F95C5631995BD20E35B9038F15F" xlink:to="lab_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_C4AE6F95C5631995BD20E35B9038F15F" xlink:type="arc" />
    <link:label id="lab_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_147A2F2DF545405FE701E35B90381DB6_terseLabel_en-US" xlink:label="lab_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_147A2F2DF545405FE701E35B90381DB6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Antidilutive Securities [Axis]</link:label>
    <link:label id="lab_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_147A2F2DF545405FE701E35B90381DB6_label_en-US" xlink:label="lab_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_147A2F2DF545405FE701E35B90381DB6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Antidilutive Securities [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_147A2F2DF545405FE701E35B90381DB6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_147A2F2DF545405FE701E35B90381DB6" xlink:to="lab_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_147A2F2DF545405FE701E35B90381DB6" xlink:type="arc" />
    <link:label id="lab_us-gaap_AntidilutiveSecuritiesNameDomain_94B46D46EDCC877D08BAE35B9038A0FA_terseLabel_en-US" xlink:label="lab_us-gaap_AntidilutiveSecuritiesNameDomain_94B46D46EDCC877D08BAE35B9038A0FA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Antidilutive Securities, Name [Domain]</link:label>
    <link:label id="lab_us-gaap_AntidilutiveSecuritiesNameDomain_94B46D46EDCC877D08BAE35B9038A0FA_label_en-US" xlink:label="lab_us-gaap_AntidilutiveSecuritiesNameDomain_94B46D46EDCC877D08BAE35B9038A0FA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Antidilutive Securities, Name [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_94B46D46EDCC877D08BAE35B9038A0FA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_94B46D46EDCC877D08BAE35B9038A0FA" xlink:to="lab_us-gaap_AntidilutiveSecuritiesNameDomain_94B46D46EDCC877D08BAE35B9038A0FA" xlink:type="arc" />
    <link:label id="lab_us-gaap_EmployeeStockOptionMember_39CAB36AC17889CC61ACE35B903846A3_terseLabel_en-US" xlink:label="lab_us-gaap_EmployeeStockOptionMember_39CAB36AC17889CC61ACE35B903846A3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Stock Options</link:label>
    <link:label id="lab_us-gaap_EmployeeStockOptionMember_39CAB36AC17889CC61ACE35B903846A3_label_en-US" xlink:label="lab_us-gaap_EmployeeStockOptionMember_39CAB36AC17889CC61ACE35B903846A3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Employee Stock Option [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="loc_us-gaap_EmployeeStockOptionMember_39CAB36AC17889CC61ACE35B903846A3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EmployeeStockOptionMember_39CAB36AC17889CC61ACE35B903846A3" xlink:to="lab_us-gaap_EmployeeStockOptionMember_39CAB36AC17889CC61ACE35B903846A3" xlink:type="arc" />
    <link:label id="lab_ptct_RestrictedStockAndRestrictedStockUnitsMember_AEEACD379BDB711BAA81E35B9038EB0D_terseLabel_en-US" xlink:label="lab_ptct_RestrictedStockAndRestrictedStockUnitsMember_AEEACD379BDB711BAA81E35B9038EB0D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unvested restricted stock awards and units</link:label>
    <link:label id="lab_ptct_RestrictedStockAndRestrictedStockUnitsMember_AEEACD379BDB711BAA81E35B9038EB0D_label_en-US" xlink:label="lab_ptct_RestrictedStockAndRestrictedStockUnitsMember_AEEACD379BDB711BAA81E35B9038EB0D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Restricted Stock And Restricted Stock Units [Member]</link:label>
    <link:label id="lab_ptct_RestrictedStockAndRestrictedStockUnitsMember_AEEACD379BDB711BAA81E35B9038EB0D_documentation_en-US" xlink:label="lab_ptct_RestrictedStockAndRestrictedStockUnitsMember_AEEACD379BDB711BAA81E35B9038EB0D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information pertaining to Restricted Stock and Restricted Stock Units (RSUs).</link:label>
    <link:loc xlink:href="ptct-20160930.xsd#ptct_RestrictedStockAndRestrictedStockUnitsMember" xlink:label="loc_ptct_RestrictedStockAndRestrictedStockUnitsMember_AEEACD379BDB711BAA81E35B9038EB0D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_RestrictedStockAndRestrictedStockUnitsMember_AEEACD379BDB711BAA81E35B9038EB0D" xlink:to="lab_ptct_RestrictedStockAndRestrictedStockUnitsMember_AEEACD379BDB711BAA81E35B9038EB0D" xlink:type="arc" />
    <link:label id="lab_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_B062B8A8F43E3DB3969EE35B90395AD8_terseLabel_en-US" xlink:label="lab_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_B062B8A8F43E3DB3969EE35B90395AD8" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Net loss per share</link:label>
    <link:label id="lab_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_B062B8A8F43E3DB3969EE35B90395AD8_label_en-US" xlink:label="lab_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_B062B8A8F43E3DB3969EE35B90395AD8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_B062B8A8F43E3DB3969EE35B90395AD8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_B062B8A8F43E3DB3969EE35B90395AD8" xlink:to="lab_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_B062B8A8F43E3DB3969EE35B90395AD8" xlink:type="arc" />
    <link:label id="lab_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_12B276772F43EFC6E0D3E35B9039DD86_terseLabel_en-US" xlink:label="lab_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_12B276772F43EFC6E0D3E35B9039DD86" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Total shares excluded from calculation</link:label>
    <link:label id="lab_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_12B276772F43EFC6E0D3E35B9039DD86_label_en-US" xlink:label="lab_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_12B276772F43EFC6E0D3E35B9039DD86" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_12B276772F43EFC6E0D3E35B9039DD86" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_12B276772F43EFC6E0D3E35B9039DD86" xlink:to="lab_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_12B276772F43EFC6E0D3E35B9039DD86" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentFaceAmount_9409305BC7E469EE21471BB71D9ABE22_terseLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentFaceAmount_9409305BC7E469EE21471BB71D9ABE22" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Principal</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentFaceAmount" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_9409305BC7E469EE21471BB71D9ABE22" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentFaceAmount_9409305BC7E469EE21471BB71D9ABE22" xlink:to="lab_us-gaap_DebtInstrumentFaceAmount_9409305BC7E469EE21471BB71D9ABE22" xlink:type="arc" />
    <link:label id="lab_us-gaap_UnamortizedDebtIssuanceExpense_D57D5BEF2D9B3ECFF81B1BB71D9A9D41_negatedLabel_en-US" xlink:label="lab_us-gaap_UnamortizedDebtIssuanceExpense_D57D5BEF2D9B3ECFF81B1BB71D9A9D41" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Less: Debt issuance costs</link:label>
    <link:label id="lab_us-gaap_UnamortizedDebtIssuanceExpense_D57D5BEF2D9B3ECFF81B1BB71D9A9D41_label_en-US" xlink:label="lab_us-gaap_UnamortizedDebtIssuanceExpense_D57D5BEF2D9B3ECFF81B1BB71D9A9D41" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Unamortized Debt Issuance Expense</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_UnamortizedDebtIssuanceExpense" xlink:label="loc_us-gaap_UnamortizedDebtIssuanceExpense_D57D5BEF2D9B3ECFF81B1BB71D9A9D41" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_UnamortizedDebtIssuanceExpense_D57D5BEF2D9B3ECFF81B1BB71D9A9D41" xlink:to="lab_us-gaap_UnamortizedDebtIssuanceExpense_D57D5BEF2D9B3ECFF81B1BB71D9A9D41" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtInstrumentUnamortizedDiscount_5C5BDD4AA0C10D2706AA1BB71D9A0914_negatedLabel_en-US" xlink:label="lab_us-gaap_DebtInstrumentUnamortizedDiscount_5C5BDD4AA0C10D2706AA1BB71D9A0914" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Less: Debt discount, net</link:label>
    <link:label id="lab_us-gaap_DebtInstrumentUnamortizedDiscount_5C5BDD4AA0C10D2706AA1BB71D9A0914_label_en-US" xlink:label="lab_us-gaap_DebtInstrumentUnamortizedDiscount_5C5BDD4AA0C10D2706AA1BB71D9A0914" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Instrument, Unamortized Discount</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtInstrumentUnamortizedDiscount" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscount_5C5BDD4AA0C10D2706AA1BB71D9A0914" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtInstrumentUnamortizedDiscount_5C5BDD4AA0C10D2706AA1BB71D9A0914" xlink:to="lab_us-gaap_DebtInstrumentUnamortizedDiscount_5C5BDD4AA0C10D2706AA1BB71D9A0914" xlink:type="arc" />
    <link:label id="lab_us-gaap_LongTermDebt_464FEE1DEF2E17A839AA1BB71D9A1C3B_totalLabel_en-US" xlink:label="lab_us-gaap_LongTermDebt_464FEE1DEF2E17A839AA1BB71D9A1C3B" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net carrying amount</link:label>
    <link:label id="lab_us-gaap_LongTermDebt_464FEE1DEF2E17A839AA1BB71D9A1C3B_label_en-US" xlink:label="lab_us-gaap_LongTermDebt_464FEE1DEF2E17A839AA1BB71D9A1C3B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongTermDebt" xlink:label="loc_us-gaap_LongTermDebt_464FEE1DEF2E17A839AA1BB71D9A1C3B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongTermDebt_464FEE1DEF2E17A839AA1BB71D9A1C3B" xlink:to="lab_us-gaap_LongTermDebt_464FEE1DEF2E17A839AA1BB71D9A1C3B" xlink:type="arc" />
    <link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_90F067ACF8DBD9C0E6CE216E19606DC6_terseLabel_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_90F067ACF8DBD9C0E6CE216E19606DC6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accumulated Other Comprehensive Income (Loss) [Table]</link:label>
    <link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_90F067ACF8DBD9C0E6CE216E19606DC6_label_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_90F067ACF8DBD9C0E6CE216E19606DC6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accumulated Other Comprehensive Income (Loss) [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_90F067ACF8DBD9C0E6CE216E19606DC6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_90F067ACF8DBD9C0E6CE216E19606DC6" xlink:to="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_90F067ACF8DBD9C0E6CE216E19606DC6" xlink:type="arc" />
    <link:label id="lab_us-gaap_StatementEquityComponentsAxis_38B05A85C0035CF6380E216E19602B67_terseLabel_en-US" xlink:label="lab_us-gaap_StatementEquityComponentsAxis_38B05A85C0035CF6380E216E19602B67" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Equity Components [Axis]</link:label>
    <link:label id="lab_us-gaap_StatementEquityComponentsAxis_38B05A85C0035CF6380E216E19602B67_label_en-US" xlink:label="lab_us-gaap_StatementEquityComponentsAxis_38B05A85C0035CF6380E216E19602B67" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equity Components [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_38B05A85C0035CF6380E216E19602B67" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_38B05A85C0035CF6380E216E19602B67" xlink:to="lab_us-gaap_StatementEquityComponentsAxis_38B05A85C0035CF6380E216E19602B67" xlink:type="arc" />
    <link:label id="lab_us-gaap_EquityComponentDomain_1CAEE0BCC48EF85B53A4216E19607508_terseLabel_en-US" xlink:label="lab_us-gaap_EquityComponentDomain_1CAEE0BCC48EF85B53A4216E19607508" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Equity Component [Domain]</link:label>
    <link:label id="lab_us-gaap_EquityComponentDomain_1CAEE0BCC48EF85B53A4216E19607508_label_en-US" xlink:label="lab_us-gaap_EquityComponentDomain_1CAEE0BCC48EF85B53A4216E19607508" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equity Component [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_1CAEE0BCC48EF85B53A4216E19607508" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EquityComponentDomain_1CAEE0BCC48EF85B53A4216E19607508" xlink:to="lab_us-gaap_EquityComponentDomain_1CAEE0BCC48EF85B53A4216E19607508" xlink:type="arc" />
    <link:label id="lab_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_04E114754B3EDAE2DACC216E196037B4_terseLabel_en-US" xlink:label="lab_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_04E114754B3EDAE2DACC216E196037B4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unrealized Gains/(Losses) On Marketable Securities, net of tax</link:label>
    <link:label id="lab_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_04E114754B3EDAE2DACC216E196037B4_label_en-US" xlink:label="lab_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_04E114754B3EDAE2DACC216E196037B4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember" xlink:label="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_04E114754B3EDAE2DACC216E196037B4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_04E114754B3EDAE2DACC216E196037B4" xlink:to="lab_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_04E114754B3EDAE2DACC216E196037B4" xlink:type="arc" />
    <link:label id="lab_us-gaap_AccumulatedTranslationAdjustmentMember_890DFC0A46BA86FDC25C216E1961BF49_terseLabel_en-US" xlink:label="lab_us-gaap_AccumulatedTranslationAdjustmentMember_890DFC0A46BA86FDC25C216E1961BF49" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Foreign Currency Translation</link:label>
    <link:label id="lab_us-gaap_AccumulatedTranslationAdjustmentMember_890DFC0A46BA86FDC25C216E1961BF49_label_en-US" xlink:label="lab_us-gaap_AccumulatedTranslationAdjustmentMember_890DFC0A46BA86FDC25C216E1961BF49" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accumulated Foreign Currency Adjustment Attributable to Parent [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccumulatedTranslationAdjustmentMember" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_890DFC0A46BA86FDC25C216E1961BF49" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccumulatedTranslationAdjustmentMember_890DFC0A46BA86FDC25C216E1961BF49" xlink:to="lab_us-gaap_AccumulatedTranslationAdjustmentMember_890DFC0A46BA86FDC25C216E1961BF49" xlink:type="arc" />
    <link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_B076B880483228C7EB44216E1961A7AD_terseLabel_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_B076B880483228C7EB44216E1961A7AD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other comprehensive income (loss) and accumulated other comprehensive items</link:label>
    <link:label id="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_B076B880483228C7EB44216E1961A7AD_label_en-US" xlink:label="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_B076B880483228C7EB44216E1961A7AD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accumulated Other Comprehensive Income (Loss) [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_B076B880483228C7EB44216E1961A7AD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_B076B880483228C7EB44216E1961A7AD" xlink:to="lab_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_B076B880483228C7EB44216E1961A7AD" xlink:type="arc" />
    <link:label id="lab_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_B19A4082C130AD7F1EDA216E1961228A_terseLabel_en-US" xlink:label="lab_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_B19A4082C130AD7F1EDA216E1961228A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]</link:label>
    <link:label id="lab_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_B19A4082C130AD7F1EDA216E1961228A_label_en-US" xlink:label="lab_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_B19A4082C130AD7F1EDA216E1961228A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_B19A4082C130AD7F1EDA216E1961228A" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_B19A4082C130AD7F1EDA216E1961228A" xlink:to="lab_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_B19A4082C130AD7F1EDA216E1961228A" xlink:type="arc" />
    <link:label id="lab_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_CD92CC90907914A714E6216E19612222_periodStartLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_CD92CC90907914A714E6216E19612222" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:type="resource" xml:lang="en-US">Beginning Balance</link:label>
    <link:label id="lab_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_CD92CC90907914A714E6216E19612222_label_en-US" xlink:label="lab_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_CD92CC90907914A714E6216E19612222" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_CD92CC90907914A714E6216E19612222" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_CD92CC90907914A714E6216E19612222" xlink:to="lab_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_CD92CC90907914A714E6216E19612222" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_C707219CCCEED2D4D2A4216E19616B2C_verboseLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_C707219CCCEED2D4D2A4216E19616B2C" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Other comprehensive (loss) income before reclassifications</link:label>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_C707219CCCEED2D4D2A4216E19616B2C_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_C707219CCCEED2D4D2A4216E19616B2C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income (Loss), before Reclassifications, Net of Tax</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_C707219CCCEED2D4D2A4216E19616B2C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_C707219CCCEED2D4D2A4216E19616B2C" xlink:to="lab_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_C707219CCCEED2D4D2A4216E19616B2C" xlink:type="arc" />
    <link:label id="lab_us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_A6784D8AA0626DC69035216E19616863_terseLabel_en-US" xlink:label="lab_us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_A6784D8AA0626DC69035216E19616863" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Amounts reclassified from other comprehensive items</link:label>
    <link:label id="lab_us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_A6784D8AA0626DC69035216E19616863_label_en-US" xlink:label="lab_us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_A6784D8AA0626DC69035216E19616863" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent" xlink:label="loc_us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_A6784D8AA0626DC69035216E19616863" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_A6784D8AA0626DC69035216E19616863" xlink:to="lab_us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_A6784D8AA0626DC69035216E19616863" xlink:type="arc" />
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTax_2EE37379824312D85E2B216E1961D0D3_totalLabel_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTax_2EE37379824312D85E2B216E1961D0D3" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Other comprehensive (loss) income</link:label>
    <link:label id="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTax_2EE37379824312D85E2B216E1961D0D3_label_en-US" xlink:label="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTax_2EE37379824312D85E2B216E1961D0D3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Comprehensive Income (Loss), Net of Tax</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_2EE37379824312D85E2B216E1961D0D3" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_2EE37379824312D85E2B216E1961D0D3" xlink:to="lab_us-gaap_OtherComprehensiveIncomeLossNetOfTax_2EE37379824312D85E2B216E1961D0D3" xlink:type="arc" />
    <link:label id="lab_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_AB988775BE96E41CC3D3216E19617962_periodEndLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_AB988775BE96E41CC3D3216E19617962" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Ending Balance</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_AB988775BE96E41CC3D3216E19617962" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_AB988775BE96E41CC3D3216E19617962" xlink:to="lab_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_AB988775BE96E41CC3D3216E19617962" xlink:type="arc" />
    <link:label id="lab_us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis_5841E5E45E0D8D6974A51CF34537D4C7_terseLabel_en-US" xlink:label="lab_us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis_5841E5E45E0D8D6974A51CF34537D4C7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Employee Stock Ownership Plan (ESOP) Name [Axis]</link:label>
    <link:label id="lab_us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis_5841E5E45E0D8D6974A51CF34537D4C7_label_en-US" xlink:label="lab_us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis_5841E5E45E0D8D6974A51CF34537D4C7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Employee Stock Ownership Plan (ESOP) Name [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis" xlink:label="loc_us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis_5841E5E45E0D8D6974A51CF34537D4C7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis_5841E5E45E0D8D6974A51CF34537D4C7" xlink:to="lab_us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis_5841E5E45E0D8D6974A51CF34537D4C7" xlink:type="arc" />
    <link:label id="lab_us-gaap_EmployeeStockOwnershipPlanESOPPlanDomain_818F11607E19C402258B1CF3453781B6_terseLabel_en-US" xlink:label="lab_us-gaap_EmployeeStockOwnershipPlanESOPPlanDomain_818F11607E19C402258B1CF3453781B6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Employee Stock Ownership Plan (ESOP), Plan [Domain]</link:label>
    <link:label id="lab_us-gaap_EmployeeStockOwnershipPlanESOPPlanDomain_818F11607E19C402258B1CF3453781B6_label_en-US" xlink:label="lab_us-gaap_EmployeeStockOwnershipPlanESOPPlanDomain_818F11607E19C402258B1CF3453781B6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Employee Stock Ownership Plan (ESOP), Plan [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EmployeeStockOwnershipPlanESOPPlanDomain" xlink:label="loc_us-gaap_EmployeeStockOwnershipPlanESOPPlanDomain_818F11607E19C402258B1CF3453781B6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EmployeeStockOwnershipPlanESOPPlanDomain_818F11607E19C402258B1CF3453781B6" xlink:to="lab_us-gaap_EmployeeStockOwnershipPlanESOPPlanDomain_818F11607E19C402258B1CF3453781B6" xlink:type="arc" />
    <link:label id="lab_ptct_EmployeeStockPurchasePlanMember_518C2AC112618E47DEC81CF34537BCB1_terseLabel_en-US" xlink:label="lab_ptct_EmployeeStockPurchasePlanMember_518C2AC112618E47DEC81CF34537BCB1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Employee Stock Purchase Plan</link:label>
    <link:label id="lab_ptct_EmployeeStockPurchasePlanMember_518C2AC112618E47DEC81CF34537BCB1_label_en-US" xlink:label="lab_ptct_EmployeeStockPurchasePlanMember_518C2AC112618E47DEC81CF34537BCB1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Employee Stock Purchase Plan [Member]</link:label>
    <link:label id="lab_ptct_EmployeeStockPurchasePlanMember_518C2AC112618E47DEC81CF34537BCB1_documentation_en-US" xlink:label="lab_ptct_EmployeeStockPurchasePlanMember_518C2AC112618E47DEC81CF34537BCB1" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Employee Stock Purchase Plan [Member]</link:label>
    <link:loc xlink:href="ptct-20160930.xsd#ptct_EmployeeStockPurchasePlanMember" xlink:label="loc_ptct_EmployeeStockPurchasePlanMember_518C2AC112618E47DEC81CF34537BCB1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_EmployeeStockPurchasePlanMember_518C2AC112618E47DEC81CF34537BCB1" xlink:to="lab_ptct_EmployeeStockPurchasePlanMember_518C2AC112618E47DEC81CF34537BCB1" xlink:type="arc" />
    <link:label id="lab_us-gaap_PlanNameAxis_E66A434142BDE211577B1CF34538C9D6_terseLabel_en-US" xlink:label="lab_us-gaap_PlanNameAxis_E66A434142BDE211577B1CF34538C9D6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Plan Name [Axis]</link:label>
    <link:label id="lab_us-gaap_PlanNameAxis_E66A434142BDE211577B1CF34538C9D6_label_en-US" xlink:label="lab_us-gaap_PlanNameAxis_E66A434142BDE211577B1CF34538C9D6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Plan Name [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PlanNameAxis" xlink:label="loc_us-gaap_PlanNameAxis_E66A434142BDE211577B1CF34538C9D6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PlanNameAxis_E66A434142BDE211577B1CF34538C9D6" xlink:to="lab_us-gaap_PlanNameAxis_E66A434142BDE211577B1CF34538C9D6" xlink:type="arc" />
    <link:label id="lab_us-gaap_PlanNameDomain_C4B0A65F123122E1CC9C1CF34538F09C_terseLabel_en-US" xlink:label="lab_us-gaap_PlanNameDomain_C4B0A65F123122E1CC9C1CF34538F09C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Plan Name [Domain]</link:label>
    <link:label id="lab_us-gaap_PlanNameDomain_C4B0A65F123122E1CC9C1CF34538F09C_label_en-US" xlink:label="lab_us-gaap_PlanNameDomain_C4B0A65F123122E1CC9C1CF34538F09C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Plan Name [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_C4B0A65F123122E1CC9C1CF34538F09C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PlanNameDomain_C4B0A65F123122E1CC9C1CF34538F09C" xlink:to="lab_us-gaap_PlanNameDomain_C4B0A65F123122E1CC9C1CF34538F09C" xlink:type="arc" />
    <link:label id="lab_ptct_StockIncentivePlan2013Member_8ADEB2F64773A32EB4061CF34538CB99_terseLabel_en-US" xlink:label="lab_ptct_StockIncentivePlan2013Member_8ADEB2F64773A32EB4061CF34538CB99" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2013 Stock Incentive Plan</link:label>
    <link:label id="lab_ptct_StockIncentivePlan2013Member_8ADEB2F64773A32EB4061CF34538CB99_label_en-US" xlink:label="lab_ptct_StockIncentivePlan2013Member_8ADEB2F64773A32EB4061CF34538CB99" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stock Incentive Plan2013 [Member]</link:label>
    <link:label id="lab_ptct_StockIncentivePlan2013Member_8ADEB2F64773A32EB4061CF34538CB99_documentation_en-US" xlink:label="lab_ptct_StockIncentivePlan2013Member_8ADEB2F64773A32EB4061CF34538CB99" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information pertaining to the 2013 Stock Incentive Plan.</link:label>
    <link:loc xlink:href="ptct-20160930.xsd#ptct_StockIncentivePlan2013Member" xlink:label="loc_ptct_StockIncentivePlan2013Member_8ADEB2F64773A32EB4061CF34538CB99" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_StockIncentivePlan2013Member_8ADEB2F64773A32EB4061CF34538CB99" xlink:to="lab_ptct_StockIncentivePlan2013Member_8ADEB2F64773A32EB4061CF34538CB99" xlink:type="arc" />
    <link:label id="lab_ptct_EquityAndLongTermIncentivePlan2009Member_EDCA52107482F6EC55461CF34538DE27_terseLabel_en-US" xlink:label="lab_ptct_EquityAndLongTermIncentivePlan2009Member_EDCA52107482F6EC55461CF34538DE27" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2009 Equity and Long Term Incentive Plan</link:label>
    <link:label id="lab_ptct_EquityAndLongTermIncentivePlan2009Member_EDCA52107482F6EC55461CF34538DE27_label_en-US" xlink:label="lab_ptct_EquityAndLongTermIncentivePlan2009Member_EDCA52107482F6EC55461CF34538DE27" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equity And Long Term Incentive Plan2009 [Member]</link:label>
    <link:label id="lab_ptct_EquityAndLongTermIncentivePlan2009Member_EDCA52107482F6EC55461CF34538DE27_documentation_en-US" xlink:label="lab_ptct_EquityAndLongTermIncentivePlan2009Member_EDCA52107482F6EC55461CF34538DE27" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information pertaining to the 2009 Equity and Long-Term Incentive Plan.</link:label>
    <link:loc xlink:href="ptct-20160930.xsd#ptct_EquityAndLongTermIncentivePlan2009Member" xlink:label="loc_ptct_EquityAndLongTermIncentivePlan2009Member_EDCA52107482F6EC55461CF34538DE27" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_EquityAndLongTermIncentivePlan2009Member_EDCA52107482F6EC55461CF34538DE27" xlink:to="lab_ptct_EquityAndLongTermIncentivePlan2009Member_EDCA52107482F6EC55461CF34538DE27" xlink:type="arc" />
    <link:label id="lab_ptct_Equity2009AndLongTermIncentivePlanAndStockIncentivePlan2013Member_4E7CC077AC0398CF4F241CF3453858EC_terseLabel_en-US" xlink:label="lab_ptct_Equity2009AndLongTermIncentivePlanAndStockIncentivePlan2013Member_4E7CC077AC0398CF4F241CF3453858EC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2009 Equity and Long Term Incentive Plan and 2013 Stock Incentive Plan</link:label>
    <link:label id="lab_ptct_Equity2009AndLongTermIncentivePlanAndStockIncentivePlan2013Member_4E7CC077AC0398CF4F241CF3453858EC_label_en-US" xlink:label="lab_ptct_Equity2009AndLongTermIncentivePlanAndStockIncentivePlan2013Member_4E7CC077AC0398CF4F241CF3453858EC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Equity2009 And Long Term Incentive Plan And Stock Incentive Plan2013 [Member]</link:label>
    <link:label id="lab_ptct_Equity2009AndLongTermIncentivePlanAndStockIncentivePlan2013Member_4E7CC077AC0398CF4F241CF3453858EC_documentation_en-US" xlink:label="lab_ptct_Equity2009AndLongTermIncentivePlanAndStockIncentivePlan2013Member_4E7CC077AC0398CF4F241CF3453858EC" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information pertaining to the 2009 Equity and Long Term Incentive Plan and 2013 Stock Incentive Plan.</link:label>
    <link:loc xlink:href="ptct-20160930.xsd#ptct_Equity2009AndLongTermIncentivePlanAndStockIncentivePlan2013Member" xlink:label="loc_ptct_Equity2009AndLongTermIncentivePlanAndStockIncentivePlan2013Member_4E7CC077AC0398CF4F241CF3453858EC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_Equity2009AndLongTermIncentivePlanAndStockIncentivePlan2013Member_4E7CC077AC0398CF4F241CF3453858EC" xlink:to="lab_ptct_Equity2009AndLongTermIncentivePlanAndStockIncentivePlan2013Member_4E7CC077AC0398CF4F241CF3453858EC" xlink:type="arc" />
    <link:label id="lab_ptct_LongTermIncentivePlan2013Member_F8DB9421C0461049DE631CF345384114_terseLabel_en-US" xlink:label="lab_ptct_LongTermIncentivePlan2013Member_F8DB9421C0461049DE631CF345384114" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2013 Long Term Incentive Plan</link:label>
    <link:label id="lab_ptct_LongTermIncentivePlan2013Member_F8DB9421C0461049DE631CF345384114_label_en-US" xlink:label="lab_ptct_LongTermIncentivePlan2013Member_F8DB9421C0461049DE631CF345384114" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long Term Incentive Plan2013 [Member]</link:label>
    <link:label id="lab_ptct_LongTermIncentivePlan2013Member_F8DB9421C0461049DE631CF345384114_documentation_en-US" xlink:label="lab_ptct_LongTermIncentivePlan2013Member_F8DB9421C0461049DE631CF345384114" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents information pertaining to the 2013 Long Term Incentive Plan.</link:label>
    <link:loc xlink:href="ptct-20160930.xsd#ptct_LongTermIncentivePlan2013Member" xlink:label="loc_ptct_LongTermIncentivePlan2013Member_F8DB9421C0461049DE631CF345384114" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_LongTermIncentivePlan2013Member_F8DB9421C0461049DE631CF345384114" xlink:to="lab_ptct_LongTermIncentivePlan2013Member_F8DB9421C0461049DE631CF345384114" xlink:type="arc" />
    <link:label id="lab_ptct_EmployeeDirectorAndConsultantStockOptionPlanMember_1E0D0B32DDE29516F3B71CF345388A10_terseLabel_en-US" xlink:label="lab_ptct_EmployeeDirectorAndConsultantStockOptionPlanMember_1E0D0B32DDE29516F3B71CF345388A10" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">1998 Employee, Director and Consultant Stock Option Plan</link:label>
    <link:label id="lab_ptct_EmployeeDirectorAndConsultantStockOptionPlanMember_1E0D0B32DDE29516F3B71CF345388A10_label_en-US" xlink:label="lab_ptct_EmployeeDirectorAndConsultantStockOptionPlanMember_1E0D0B32DDE29516F3B71CF345388A10" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Employee Director And Consultant Stock Option Plan [Member]</link:label>
    <link:label id="lab_ptct_EmployeeDirectorAndConsultantStockOptionPlanMember_1E0D0B32DDE29516F3B71CF345388A10_documentation_en-US" xlink:label="lab_ptct_EmployeeDirectorAndConsultantStockOptionPlanMember_1E0D0B32DDE29516F3B71CF345388A10" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the 1998 Employee, Director and Consultant Stock Option Plan</link:label>
    <link:loc xlink:href="ptct-20160930.xsd#ptct_EmployeeDirectorAndConsultantStockOptionPlanMember" xlink:label="loc_ptct_EmployeeDirectorAndConsultantStockOptionPlanMember_1E0D0B32DDE29516F3B71CF345388A10" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_EmployeeDirectorAndConsultantStockOptionPlanMember_1E0D0B32DDE29516F3B71CF345388A10" xlink:to="lab_ptct_EmployeeDirectorAndConsultantStockOptionPlanMember_1E0D0B32DDE29516F3B71CF345388A10" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_84B2CB79E9FEE8B4ED291CF345393DF9_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_84B2CB79E9FEE8B4ED291CF345393DF9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of shares authorized (in shares)</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_84B2CB79E9FEE8B4ED291CF345393DF9_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_84B2CB79E9FEE8B4ED291CF345393DF9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_84B2CB79E9FEE8B4ED291CF345393DF9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_84B2CB79E9FEE8B4ED291CF345393DF9" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_84B2CB79E9FEE8B4ED291CF345393DF9" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_D159550880AB31C3ED581D02F6DC6EC7_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_D159550880AB31C3ED581D02F6DC6EC7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Award requisite service period</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_D159550880AB31C3ED581D02F6DC6EC7_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_D159550880AB31C3ED581D02F6DC6EC7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_D159550880AB31C3ED581D02F6DC6EC7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_D159550880AB31C3ED581D02F6DC6EC7" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_D159550880AB31C3ED581D02F6DC6EC7" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_960159D54FE99880D6D81CF345396834_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_960159D54FE99880D6D81CF345396834" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Grants in Period (in shares)</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_960159D54FE99880D6D81CF345396834_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_960159D54FE99880D6D81CF345396834" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_960159D54FE99880D6D81CF345396834" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_960159D54FE99880D6D81CF345396834" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_960159D54FE99880D6D81CF345396834" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_5AD7556CB6A76DD362141CF345398E25_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_5AD7556CB6A76DD362141CF345398E25" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of shares available for issuance (in shares)</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_5AD7556CB6A76DD362141CF345398E25_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_5AD7556CB6A76DD362141CF345398E25" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_5AD7556CB6A76DD362141CF345398E25" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_5AD7556CB6A76DD362141CF345398E25" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_5AD7556CB6A76DD362141CF345398E25" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized_D9FD8D7DBC4E7A99D7E31CF34539E2AE_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized_D9FD8D7DBC4E7A99D7E31CF34539E2AE" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of additional shares authorized (in shares)</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized_D9FD8D7DBC4E7A99D7E31CF34539E2AE_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized_D9FD8D7DBC4E7A99D7E31CF34539E2AE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized_D9FD8D7DBC4E7A99D7E31CF34539E2AE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized_D9FD8D7DBC4E7A99D7E31CF34539E2AE" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized_D9FD8D7DBC4E7A99D7E31CF34539E2AE" xlink:type="arc" />
    <link:label id="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedSharesSubjectToOutstandingAwards_B0FA94F50373C4160CF01CF345396EA7_terseLabel_en-US" xlink:label="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedSharesSubjectToOutstandingAwards_B0FA94F50373C4160CF01CF345396EA7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of shares subject to outstanding awards (in shares)</link:label>
    <link:label id="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedSharesSubjectToOutstandingAwards_B0FA94F50373C4160CF01CF345396EA7_label_en-US" xlink:label="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedSharesSubjectToOutstandingAwards_B0FA94F50373C4160CF01CF345396EA7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share based Compensation Arrangement by Share based Payment Award Number of Shares Authorized Shares Subject to Outstanding Awards</link:label>
    <link:label id="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedSharesSubjectToOutstandingAwards_B0FA94F50373C4160CF01CF345396EA7_documentation_en-US" xlink:label="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedSharesSubjectToOutstandingAwards_B0FA94F50373C4160CF01CF345396EA7" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the number of shares subject to outstanding awards used to calculate authorized shares.</link:label>
    <link:loc xlink:href="ptct-20160930.xsd#ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedSharesSubjectToOutstandingAwards" xlink:label="loc_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedSharesSubjectToOutstandingAwards_B0FA94F50373C4160CF01CF345396EA7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedSharesSubjectToOutstandingAwards_B0FA94F50373C4160CF01CF345396EA7" xlink:to="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedSharesSubjectToOutstandingAwards_B0FA94F50373C4160CF01CF345396EA7" xlink:type="arc" />
    <link:label id="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedAnnualIncreaseNumber_4FC00C359DD9507E33751CF34539A78D_terseLabel_en-US" xlink:label="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedAnnualIncreaseNumber_4FC00C359DD9507E33751CF34539A78D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Annual increase in the number of shares (in shares) on the first day of the fiscal year</link:label>
    <link:label id="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedAnnualIncreaseNumber_4FC00C359DD9507E33751CF34539A78D_label_en-US" xlink:label="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedAnnualIncreaseNumber_4FC00C359DD9507E33751CF34539A78D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share based Compensation Arrangement by Share based Payment Award Number of Shares Authorized Annual Increase Number</link:label>
    <link:label id="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedAnnualIncreaseNumber_4FC00C359DD9507E33751CF34539A78D_documentation_en-US" xlink:label="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedAnnualIncreaseNumber_4FC00C359DD9507E33751CF34539A78D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the number of shares to be added annually on the first day of each fiscal year in the number of shares authorized.</link:label>
    <link:loc xlink:href="ptct-20160930.xsd#ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedAnnualIncreaseNumber" xlink:label="loc_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedAnnualIncreaseNumber_4FC00C359DD9507E33751CF34539A78D" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedAnnualIncreaseNumber_4FC00C359DD9507E33751CF34539A78D" xlink:to="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedAnnualIncreaseNumber_4FC00C359DD9507E33751CF34539A78D" xlink:type="arc" />
    <link:label id="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedAnnualIncreaseAsPercentageOfStockOutstanding_3BD6615BAE3D0EA784C31CF34539DC08_terseLabel_en-US" xlink:label="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedAnnualIncreaseAsPercentageOfStockOutstanding_3BD6615BAE3D0EA784C31CF34539DC08" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Annual increase in the number of shares outstanding on the first day of the fiscal year (as a percent)</link:label>
    <link:label id="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedAnnualIncreaseAsPercentageOfStockOutstanding_3BD6615BAE3D0EA784C31CF34539DC08_label_en-US" xlink:label="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedAnnualIncreaseAsPercentageOfStockOutstanding_3BD6615BAE3D0EA784C31CF34539DC08" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share based Compensation Arrangement by Share based Payment Award Number of Shares Authorized Annual Increase as Percentage of Stock Outstanding</link:label>
    <link:label id="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedAnnualIncreaseAsPercentageOfStockOutstanding_3BD6615BAE3D0EA784C31CF34539DC08_documentation_en-US" xlink:label="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedAnnualIncreaseAsPercentageOfStockOutstanding_3BD6615BAE3D0EA784C31CF34539DC08" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the percentage of shares outstanding to be added annually on the first day of each fiscal year in the number of shares authorized.</link:label>
    <link:loc xlink:href="ptct-20160930.xsd#ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedAnnualIncreaseAsPercentageOfStockOutstanding" xlink:label="loc_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedAnnualIncreaseAsPercentageOfStockOutstanding_3BD6615BAE3D0EA784C31CF34539DC08" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedAnnualIncreaseAsPercentageOfStockOutstanding_3BD6615BAE3D0EA784C31CF34539DC08" xlink:to="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorizedAnnualIncreaseAsPercentageOfStockOutstanding_3BD6615BAE3D0EA784C31CF34539DC08" xlink:type="arc" />
    <link:label id="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsInducementGrantsForNonStatutoryStockOptions_605DFCB7DE9C8C43F7F41CF34539989C_terseLabel_en-US" xlink:label="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsInducementGrantsForNonStatutoryStockOptions_605DFCB7DE9C8C43F7F41CF34539989C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Inducement grants for non-statutory stock options (in shares)</link:label>
    <link:label id="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsInducementGrantsForNonStatutoryStockOptions_605DFCB7DE9C8C43F7F41CF34539989C_label_en-US" xlink:label="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsInducementGrantsForNonStatutoryStockOptions_605DFCB7DE9C8C43F7F41CF34539989C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Inducement Grants For Non-Statutory Stock Options</link:label>
    <link:label id="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsInducementGrantsForNonStatutoryStockOptions_605DFCB7DE9C8C43F7F41CF34539989C_documentation_en-US" xlink:label="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsInducementGrantsForNonStatutoryStockOptions_605DFCB7DE9C8C43F7F41CF34539989C" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the inducement grants for non-statutory stock options.</link:label>
    <link:loc xlink:href="ptct-20160930.xsd#ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsInducementGrantsForNonStatutoryStockOptions" xlink:label="loc_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsInducementGrantsForNonStatutoryStockOptions_605DFCB7DE9C8C43F7F41CF34539989C" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsInducementGrantsForNonStatutoryStockOptions_605DFCB7DE9C8C43F7F41CF34539989C" xlink:to="lab_ptct_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsInducementGrantsForNonStatutoryStockOptions_605DFCB7DE9C8C43F7F41CF34539989C" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_715D55029CB5831110151CF345391F9F_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_715D55029CB5831110151CF345391F9F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Expected dividend yield (as a percent)</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_715D55029CB5831110151CF345391F9F_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_715D55029CB5831110151CF345391F9F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_715D55029CB5831110151CF345391F9F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_715D55029CB5831110151CF345391F9F" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_715D55029CB5831110151CF345391F9F" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_3181FFFDF853127706601CF3457AE0D7_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_3181FFFDF853127706601CF3457AE0D7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Weighted average grant date fair value (in dollars per share)</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_3181FFFDF853127706601CF3457AE0D7_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_3181FFFDF853127706601CF3457AE0D7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_3181FFFDF853127706601CF3457AE0D7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_3181FFFDF853127706601CF3457AE0D7" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_3181FFFDF853127706601CF3457AE0D7" xlink:type="arc" />
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_03523F0C462588BBD4B61CF3457A36ED_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_03523F0C462588BBD4B61CF3457A36ED" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Vesting period</link:label>
    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_03523F0C462588BBD4B61CF3457A36ED_label_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_03523F0C462588BBD4B61CF3457A36ED" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_03523F0C462588BBD4B61CF3457A36ED" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_03523F0C462588BBD4B61CF3457A36ED" xlink:to="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_03523F0C462588BBD4B61CF3457A36ED" xlink:type="arc" />
    <link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent_AAA552660AA8376D61771CF3457AD5B9_terseLabel_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent_AAA552660AA8376D61771CF3457AD5B9" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Purchase price of common stock, percent</link:label>
    <link:label id="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent_AAA552660AA8376D61771CF3457AD5B9_label_en-US" xlink:label="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent_AAA552660AA8376D61771CF3457AD5B9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent_AAA552660AA8376D61771CF3457AD5B9" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent_AAA552660AA8376D61771CF3457AD5B9" xlink:to="lab_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent_AAA552660AA8376D61771CF3457AD5B9" xlink:type="arc" />
    <link:label id="lab_ptct_EmployeeStockPurchasePlanVotingPercentageLimitPercent_2D02B0545C8F01A25DF01CF3457A96DF_terseLabel_en-US" xlink:label="lab_ptct_EmployeeStockPurchasePlanVotingPercentageLimitPercent_2D02B0545C8F01A25DF01CF3457A96DF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Employee stock purchase plan, voting percentage limit</link:label>
    <link:label id="lab_ptct_EmployeeStockPurchasePlanVotingPercentageLimitPercent_2D02B0545C8F01A25DF01CF3457A96DF_label_en-US" xlink:label="lab_ptct_EmployeeStockPurchasePlanVotingPercentageLimitPercent_2D02B0545C8F01A25DF01CF3457A96DF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Employee Stock Purchase Plan, Voting Percentage Limit, Percent</link:label>
    <link:label id="lab_ptct_EmployeeStockPurchasePlanVotingPercentageLimitPercent_2D02B0545C8F01A25DF01CF3457A96DF_documentation_en-US" xlink:label="lab_ptct_EmployeeStockPurchasePlanVotingPercentageLimitPercent_2D02B0545C8F01A25DF01CF3457A96DF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Employee Stock Purchase Plan, Voting Percentage Limit, Percent</link:label>
    <link:loc xlink:href="ptct-20160930.xsd#ptct_EmployeeStockPurchasePlanVotingPercentageLimitPercent" xlink:label="loc_ptct_EmployeeStockPurchasePlanVotingPercentageLimitPercent_2D02B0545C8F01A25DF01CF3457A96DF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_EmployeeStockPurchasePlanVotingPercentageLimitPercent_2D02B0545C8F01A25DF01CF3457A96DF" xlink:to="lab_ptct_EmployeeStockPurchasePlanVotingPercentageLimitPercent_2D02B0545C8F01A25DF01CF3457A96DF" xlink:type="arc" />
    <link:label id="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_F834D53E78441F586F8E1CF3457AFD15_terseLabel_en-US" xlink:label="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_F834D53E78441F586F8E1CF3457AFD15" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unrecognized compensation cost</link:label>
    <link:label id="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_F834D53E78441F586F8E1CF3457AFD15_label_en-US" xlink:label="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_F834D53E78441F586F8E1CF3457AFD15" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_F834D53E78441F586F8E1CF3457AFD15" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_F834D53E78441F586F8E1CF3457AFD15" xlink:to="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_F834D53E78441F586F8E1CF3457AFD15" xlink:type="arc" />
    <link:label id="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_F04894C40D20FBE079801CF3457A5C0B_terseLabel_en-US" xlink:label="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_F04894C40D20FBE079801CF3457A5C0B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Weighted average remaining service period for recognition of unrecognized compensation cost</link:label>
    <link:label id="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_F04894C40D20FBE079801CF3457A5C0B_label_en-US" xlink:label="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_F04894C40D20FBE079801CF3457A5C0B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_F04894C40D20FBE079801CF3457A5C0B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_F04894C40D20FBE079801CF3457A5C0B" xlink:to="lab_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_F04894C40D20FBE079801CF3457A5C0B" xlink:type="arc" />
    <link:label id="lab_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_893F192632AF1A78A9DE226402403797_terseLabel_en-US" xlink:label="lab_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_893F192632AF1A78A9DE226402403797" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">New Accounting Pronouncements or Change in Accounting Principle [Table]</link:label>
    <link:label id="lab_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_893F192632AF1A78A9DE226402403797_label_en-US" xlink:label="lab_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_893F192632AF1A78A9DE226402403797" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">New Accounting Pronouncements or Change in Accounting Principle [Table]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_893F192632AF1A78A9DE226402403797" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_893F192632AF1A78A9DE226402403797" xlink:to="lab_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_893F192632AF1A78A9DE226402403797" xlink:type="arc" />
    <link:label id="lab_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_6342597BDFA7904EBB812261B63DE26E_terseLabel_en-US" xlink:label="lab_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_6342597BDFA7904EBB812261B63DE26E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Adjustments for New Accounting Pronouncements [Axis]</link:label>
    <link:label id="lab_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_6342597BDFA7904EBB812261B63DE26E_label_en-US" xlink:label="lab_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_6342597BDFA7904EBB812261B63DE26E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Adjustments for New Accounting Pronouncements [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AdjustmentsForNewAccountingPronouncementsAxis" xlink:label="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_6342597BDFA7904EBB812261B63DE26E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_6342597BDFA7904EBB812261B63DE26E" xlink:to="lab_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_6342597BDFA7904EBB812261B63DE26E" xlink:type="arc" />
    <link:label id="lab_us-gaap_TypeOfAdoptionMember_DE3ED4CB6CD9963C942B2261B63D03CA_terseLabel_en-US" xlink:label="lab_us-gaap_TypeOfAdoptionMember_DE3ED4CB6CD9963C942B2261B63D03CA" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Type of Adoption [Domain]</link:label>
    <link:label id="lab_us-gaap_TypeOfAdoptionMember_DE3ED4CB6CD9963C942B2261B63D03CA_label_en-US" xlink:label="lab_us-gaap_TypeOfAdoptionMember_DE3ED4CB6CD9963C942B2261B63D03CA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Type of Adoption [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_TypeOfAdoptionMember" xlink:label="loc_us-gaap_TypeOfAdoptionMember_DE3ED4CB6CD9963C942B2261B63D03CA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_TypeOfAdoptionMember_DE3ED4CB6CD9963C942B2261B63D03CA" xlink:to="lab_us-gaap_TypeOfAdoptionMember_DE3ED4CB6CD9963C942B2261B63D03CA" xlink:type="arc" />
    <link:label id="lab_ptct_AccountingStandardsUpdate201503Member_BCC8CD59E34BE44625472261B63D0D03_terseLabel_en-US" xlink:label="lab_ptct_AccountingStandardsUpdate201503Member_BCC8CD59E34BE44625472261B63D0D03" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Accounting Standards Update 2015-03</link:label>
    <link:label id="lab_ptct_AccountingStandardsUpdate201503Member_BCC8CD59E34BE44625472261B63D0D03_label_en-US" xlink:label="lab_ptct_AccountingStandardsUpdate201503Member_BCC8CD59E34BE44625472261B63D0D03" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Accounting Standards Update 2015-03 [Member]</link:label>
    <link:label id="lab_ptct_AccountingStandardsUpdate201503Member_BCC8CD59E34BE44625472261B63D0D03_documentation_en-US" xlink:label="lab_ptct_AccountingStandardsUpdate201503Member_BCC8CD59E34BE44625472261B63D0D03" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Accounting Standards Update No. 2015-03, Simplifying the Presentation of Debt Issuance Costs.</link:label>
    <link:loc xlink:href="ptct-20160930.xsd#ptct_AccountingStandardsUpdate201503Member" xlink:label="loc_ptct_AccountingStandardsUpdate201503Member_BCC8CD59E34BE44625472261B63D0D03" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_AccountingStandardsUpdate201503Member_BCC8CD59E34BE44625472261B63D0D03" xlink:to="lab_ptct_AccountingStandardsUpdate201503Member_BCC8CD59E34BE44625472261B63D0D03" xlink:type="arc" />
    <link:label id="lab_us-gaap_BalanceSheetLocationAxis_C76E5FC7BCEA1A642A062261B63D0F0E_terseLabel_en-US" xlink:label="lab_us-gaap_BalanceSheetLocationAxis_C76E5FC7BCEA1A642A062261B63D0F0E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Balance Sheet Location [Axis]</link:label>
    <link:label id="lab_us-gaap_BalanceSheetLocationAxis_C76E5FC7BCEA1A642A062261B63D0F0E_label_en-US" xlink:label="lab_us-gaap_BalanceSheetLocationAxis_C76E5FC7BCEA1A642A062261B63D0F0E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Balance Sheet Location [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BalanceSheetLocationAxis" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_C76E5FC7BCEA1A642A062261B63D0F0E" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_C76E5FC7BCEA1A642A062261B63D0F0E" xlink:to="lab_us-gaap_BalanceSheetLocationAxis_C76E5FC7BCEA1A642A062261B63D0F0E" xlink:type="arc" />
    <link:label id="lab_us-gaap_BalanceSheetLocationDomain_26FADE9DF316D2A19C722261B63DCC97_terseLabel_en-US" xlink:label="lab_us-gaap_BalanceSheetLocationDomain_26FADE9DF316D2A19C722261B63DCC97" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Balance Sheet Location [Domain]</link:label>
    <link:label id="lab_us-gaap_BalanceSheetLocationDomain_26FADE9DF316D2A19C722261B63DCC97_label_en-US" xlink:label="lab_us-gaap_BalanceSheetLocationDomain_26FADE9DF316D2A19C722261B63DCC97" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Balance Sheet Location [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_26FADE9DF316D2A19C722261B63DCC97" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_26FADE9DF316D2A19C722261B63DCC97" xlink:to="lab_us-gaap_BalanceSheetLocationDomain_26FADE9DF316D2A19C722261B63DCC97" xlink:type="arc" />
    <link:label id="lab_ptct_DepositsAndOtherAssetsMember_5321FD947AA63B08B7602261B63DAE99_terseLabel_en-US" xlink:label="lab_ptct_DepositsAndOtherAssetsMember_5321FD947AA63B08B7602261B63DAE99" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Deposits and other assets</link:label>
    <link:label id="lab_ptct_DepositsAndOtherAssetsMember_5321FD947AA63B08B7602261B63DAE99_label_en-US" xlink:label="lab_ptct_DepositsAndOtherAssetsMember_5321FD947AA63B08B7602261B63DAE99" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Deposits And Other Assets [Member]</link:label>
    <link:label id="lab_ptct_DepositsAndOtherAssetsMember_5321FD947AA63B08B7602261B63DAE99_documentation_en-US" xlink:label="lab_ptct_DepositsAndOtherAssetsMember_5321FD947AA63B08B7602261B63DAE99" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Primary financial statement caption encompassing deposits and other assets.</link:label>
    <link:loc xlink:href="ptct-20160930.xsd#ptct_DepositsAndOtherAssetsMember" xlink:label="loc_ptct_DepositsAndOtherAssetsMember_5321FD947AA63B08B7602261B63DAE99" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_DepositsAndOtherAssetsMember_5321FD947AA63B08B7602261B63DAE99" xlink:to="lab_ptct_DepositsAndOtherAssetsMember_5321FD947AA63B08B7602261B63DAE99" xlink:type="arc" />
    <link:label id="lab_us-gaap_LongTermDebtMember_1EEDF850FE64921D88FB2261B63D9D90_terseLabel_en-US" xlink:label="lab_us-gaap_LongTermDebtMember_1EEDF850FE64921D88FB2261B63D9D90" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Long-term debt.</link:label>
    <link:label id="lab_us-gaap_LongTermDebtMember_1EEDF850FE64921D88FB2261B63D9D90_label_en-US" xlink:label="lab_us-gaap_LongTermDebtMember_1EEDF850FE64921D88FB2261B63D9D90" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Long-term Debt [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_LongTermDebtMember" xlink:label="loc_us-gaap_LongTermDebtMember_1EEDF850FE64921D88FB2261B63D9D90" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_LongTermDebtMember_1EEDF850FE64921D88FB2261B63D9D90" xlink:to="lab_us-gaap_LongTermDebtMember_1EEDF850FE64921D88FB2261B63D9D90" xlink:type="arc" />
    <link:label id="lab_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_D1B1FF21A7064F47A152226402438F24_terseLabel_en-US" xlink:label="lab_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_D1B1FF21A7064F47A152226402438F24" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">New Accounting Pronouncements or Change in Accounting Principle [Line Items]</link:label>
    <link:label id="lab_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_D1B1FF21A7064F47A152226402438F24_label_en-US" xlink:label="lab_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_D1B1FF21A7064F47A152226402438F24" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">New Accounting Pronouncements or Change in Accounting Principle [Line Items]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_D1B1FF21A7064F47A152226402438F24" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_D1B1FF21A7064F47A152226402438F24" xlink:to="lab_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_D1B1FF21A7064F47A152226402438F24" xlink:type="arc" />
    <link:label id="lab_us-gaap_InventoryNet_902583AEB80FDCB271882261B63DD9F8_verboseLabel_en-US" xlink:label="lab_us-gaap_InventoryNet_902583AEB80FDCB271882261B63DD9F8" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Capitalized inventory</link:label>
    <link:label id="lab_us-gaap_InventoryNet_902583AEB80FDCB271882261B63DD9F8_label_en-US" xlink:label="lab_us-gaap_InventoryNet_902583AEB80FDCB271882261B63DD9F8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Inventory, Net</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_InventoryNet" xlink:label="loc_us-gaap_InventoryNet_902583AEB80FDCB271882261B63DD9F8" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_InventoryNet_902583AEB80FDCB271882261B63DD9F8" xlink:to="lab_us-gaap_InventoryNet_902583AEB80FDCB271882261B63DD9F8" xlink:type="arc" />
    <link:label id="lab_ptct_GrossProfitMargin_01C5317A4FC7C08A29552261B63D21FF_terseLabel_en-US" xlink:label="lab_ptct_GrossProfitMargin_01C5317A4FC7C08A29552261B63D21FF" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Gross profit margin (as a percent)</link:label>
    <link:label id="lab_ptct_GrossProfitMargin_01C5317A4FC7C08A29552261B63D21FF_label_en-US" xlink:label="lab_ptct_GrossProfitMargin_01C5317A4FC7C08A29552261B63D21FF" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Gross Profit Margin</link:label>
    <link:label id="lab_ptct_GrossProfitMargin_01C5317A4FC7C08A29552261B63D21FF_documentation_en-US" xlink:label="lab_ptct_GrossProfitMargin_01C5317A4FC7C08A29552261B63D21FF" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Represents the cost of Translarna product sold as a cost of sales, the gross profit margin</link:label>
    <link:loc xlink:href="ptct-20160930.xsd#ptct_GrossProfitMargin" xlink:label="loc_ptct_GrossProfitMargin_01C5317A4FC7C08A29552261B63D21FF" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_GrossProfitMargin_01C5317A4FC7C08A29552261B63D21FF" xlink:to="lab_ptct_GrossProfitMargin_01C5317A4FC7C08A29552261B63D21FF" xlink:type="arc" />
    <link:label id="lab_us-gaap_AllowanceForDoubtfulAccountsReceivable_3FCC002AFB436611B1892261B63D7FFB_terseLabel_en-US" xlink:label="lab_us-gaap_AllowanceForDoubtfulAccountsReceivable_3FCC002AFB436611B1892261B63D7FFB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Allowance for doubtful accounts receivable</link:label>
    <link:label id="lab_us-gaap_AllowanceForDoubtfulAccountsReceivable_3FCC002AFB436611B1892261B63D7FFB_label_en-US" xlink:label="lab_us-gaap_AllowanceForDoubtfulAccountsReceivable_3FCC002AFB436611B1892261B63D7FFB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Allowance for Doubtful Accounts Receivable</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivable" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivable_3FCC002AFB436611B1892261B63D7FFB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_AllowanceForDoubtfulAccountsReceivable_3FCC002AFB436611B1892261B63D7FFB" xlink:to="lab_us-gaap_AllowanceForDoubtfulAccountsReceivable_3FCC002AFB436611B1892261B63D7FFB" xlink:type="arc" />
    <link:label id="lab_us-gaap_DebtIssuanceCosts_E3FA6730CB7AD9E99DC12261B63DBF74_verboseLabel_en-US" xlink:label="lab_us-gaap_DebtIssuanceCosts_E3FA6730CB7AD9E99DC12261B63DBF74" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Debt issuance cost</link:label>
    <link:label id="lab_us-gaap_DebtIssuanceCosts_E3FA6730CB7AD9E99DC12261B63DBF74_label_en-US" xlink:label="lab_us-gaap_DebtIssuanceCosts_E3FA6730CB7AD9E99DC12261B63DBF74" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt Issuance Cost</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_DebtIssuanceCosts" xlink:label="loc_us-gaap_DebtIssuanceCosts_E3FA6730CB7AD9E99DC12261B63DBF74" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_DebtIssuanceCosts_E3FA6730CB7AD9E99DC12261B63DBF74" xlink:to="lab_us-gaap_DebtIssuanceCosts_E3FA6730CB7AD9E99DC12261B63DBF74" xlink:type="arc" />
    <link:label id="lab_us-gaap_UnamortizedDebtIssuanceExpense_A36B8C031422FBB0CDE22261B63EFF50_terseLabel_en-US" xlink:label="lab_us-gaap_UnamortizedDebtIssuanceExpense_A36B8C031422FBB0CDE22261B63EFF50" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Unamortized debt issuance cost</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_UnamortizedDebtIssuanceExpense" xlink:label="loc_us-gaap_UnamortizedDebtIssuanceExpense_A36B8C031422FBB0CDE22261B63EFF50" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_UnamortizedDebtIssuanceExpense_A36B8C031422FBB0CDE22261B63EFF50" xlink:to="lab_us-gaap_UnamortizedDebtIssuanceExpense_A36B8C031422FBB0CDE22261B63EFF50" xlink:type="arc" />
    <link:label id="lab_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_81B0E86BC6BDCD493A9F21682969ED12_terseLabel_en-US" xlink:label="lab_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_81B0E86BC6BDCD493A9F21682969ED12" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Basis of Presentation</link:label>
    <link:label id="lab_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_81B0E86BC6BDCD493A9F21682969ED12_label_en-US" xlink:label="lab_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_81B0E86BC6BDCD493A9F21682969ED12" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Basis of Accounting, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_BasisOfAccountingPolicyPolicyTextBlock" xlink:label="loc_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_81B0E86BC6BDCD493A9F21682969ED12" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_81B0E86BC6BDCD493A9F21682969ED12" xlink:to="lab_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_81B0E86BC6BDCD493A9F21682969ED12" xlink:type="arc" />
    <link:label id="lab_us-gaap_UseOfEstimates_108D6DF83D532871BD832168296976F1_terseLabel_en-US" xlink:label="lab_us-gaap_UseOfEstimates_108D6DF83D532871BD832168296976F1" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Use of estimates</link:label>
    <link:label id="lab_us-gaap_UseOfEstimates_108D6DF83D532871BD832168296976F1_label_en-US" xlink:label="lab_us-gaap_UseOfEstimates_108D6DF83D532871BD832168296976F1" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Use of Estimates, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_UseOfEstimates" xlink:label="loc_us-gaap_UseOfEstimates_108D6DF83D532871BD832168296976F1" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_UseOfEstimates_108D6DF83D532871BD832168296976F1" xlink:to="lab_us-gaap_UseOfEstimates_108D6DF83D532871BD832168296976F1" xlink:type="arc" />
    <link:label id="lab_ptct_InventoriesAndCostOfRevenuePolicyTextBlock_E1969D8D00C8F5BB6391216829697821_terseLabel_en-US" xlink:label="lab_ptct_InventoriesAndCostOfRevenuePolicyTextBlock_E1969D8D00C8F5BB6391216829697821" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Inventories and cost of product revenue</link:label>
    <link:label id="lab_ptct_InventoriesAndCostOfRevenuePolicyTextBlock_E1969D8D00C8F5BB6391216829697821_label_en-US" xlink:label="lab_ptct_InventoriesAndCostOfRevenuePolicyTextBlock_E1969D8D00C8F5BB6391216829697821" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Inventories And Cost Of Revenue Policy Text Block</link:label>
    <link:label id="lab_ptct_InventoriesAndCostOfRevenuePolicyTextBlock_E1969D8D00C8F5BB6391216829697821_documentation_en-US" xlink:label="lab_ptct_InventoriesAndCostOfRevenuePolicyTextBlock_E1969D8D00C8F5BB6391216829697821" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Disclosure of accounting policy for inventories and cost of revenue.</link:label>
    <link:loc xlink:href="ptct-20160930.xsd#ptct_InventoriesAndCostOfRevenuePolicyTextBlock" xlink:label="loc_ptct_InventoriesAndCostOfRevenuePolicyTextBlock_E1969D8D00C8F5BB6391216829697821" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ptct_InventoriesAndCostOfRevenuePolicyTextBlock_E1969D8D00C8F5BB6391216829697821" xlink:to="lab_ptct_InventoriesAndCostOfRevenuePolicyTextBlock_E1969D8D00C8F5BB6391216829697821" xlink:type="arc" />
    <link:label id="lab_us-gaap_RevenueRecognitionPolicyTextBlock_08AED6D277DA4685680221682969F796_terseLabel_en-US" xlink:label="lab_us-gaap_RevenueRecognitionPolicyTextBlock_08AED6D277DA4685680221682969F796" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Revenue Recognition</link:label>
    <link:label id="lab_us-gaap_RevenueRecognitionPolicyTextBlock_08AED6D277DA4685680221682969F796_label_en-US" xlink:label="lab_us-gaap_RevenueRecognitionPolicyTextBlock_08AED6D277DA4685680221682969F796" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revenue Recognition, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_RevenueRecognitionPolicyTextBlock" xlink:label="loc_us-gaap_RevenueRecognitionPolicyTextBlock_08AED6D277DA4685680221682969F796" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_RevenueRecognitionPolicyTextBlock_08AED6D277DA4685680221682969F796" xlink:to="lab_us-gaap_RevenueRecognitionPolicyTextBlock_08AED6D277DA4685680221682969F796" xlink:type="arc" />
    <link:label id="lab_us-gaap_ReceivablesTradeAndOtherAccountsReceivableAllowanceForDoubtfulAccountsPolicy_0F2840BB15F91C5D9732216B89D9A4BC_terseLabel_en-US" xlink:label="lab_us-gaap_ReceivablesTradeAndOtherAccountsReceivableAllowanceForDoubtfulAccountsPolicy_0F2840BB15F91C5D9732216B89D9A4BC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Allowance for doubtful accounts</link:label>
    <link:label id="lab_us-gaap_ReceivablesTradeAndOtherAccountsReceivableAllowanceForDoubtfulAccountsPolicy_0F2840BB15F91C5D9732216B89D9A4BC_label_en-US" xlink:label="lab_us-gaap_ReceivablesTradeAndOtherAccountsReceivableAllowanceForDoubtfulAccountsPolicy_0F2840BB15F91C5D9732216B89D9A4BC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Receivables, Trade and Other Accounts Receivable, Allowance for Doubtful Accounts, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ReceivablesTradeAndOtherAccountsReceivableAllowanceForDoubtfulAccountsPolicy" xlink:label="loc_us-gaap_ReceivablesTradeAndOtherAccountsReceivableAllowanceForDoubtfulAccountsPolicy_0F2840BB15F91C5D9732216B89D9A4BC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ReceivablesTradeAndOtherAccountsReceivableAllowanceForDoubtfulAccountsPolicy_0F2840BB15F91C5D9732216B89D9A4BC" xlink:to="lab_us-gaap_ReceivablesTradeAndOtherAccountsReceivableAllowanceForDoubtfulAccountsPolicy_0F2840BB15F91C5D9732216B89D9A4BC" xlink:type="arc" />
    <link:label id="lab_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_8DC8AE95F82B63A1EC37216829696BD6_terseLabel_en-US" xlink:label="lab_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_8DC8AE95F82B63A1EC37216829696BD6" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Recently issued accounting standards</link:label>
    <link:label id="lab_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_8DC8AE95F82B63A1EC37216829696BD6_label_en-US" xlink:label="lab_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_8DC8AE95F82B63A1EC37216829696BD6" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">New Accounting Pronouncements, Policy [Policy Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock" xlink:label="loc_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_8DC8AE95F82B63A1EC37216829696BD6" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_8DC8AE95F82B63A1EC37216829696BD6" xlink:to="lab_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_8DC8AE95F82B63A1EC37216829696BD6" xlink:type="arc" />
    <link:label id="lab_us-gaap_ScheduleOfStockholdersEquityNoteWarrantsOrRightsTextBlock_36A8477EDD74BD4B20D46D888E58684F_terseLabel_en-US" xlink:label="lab_us-gaap_ScheduleOfStockholdersEquityNoteWarrantsOrRightsTextBlock_36A8477EDD74BD4B20D46D888E58684F" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Summary of the Company's outstanding warrants</link:label>
    <link:label id="lab_us-gaap_ScheduleOfStockholdersEquityNoteWarrantsOrRightsTextBlock_36A8477EDD74BD4B20D46D888E58684F_label_en-US" xlink:label="lab_us-gaap_ScheduleOfStockholdersEquityNoteWarrantsOrRightsTextBlock_36A8477EDD74BD4B20D46D888E58684F" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_ScheduleOfStockholdersEquityNoteWarrantsOrRightsTextBlock" xlink:label="loc_us-gaap_ScheduleOfStockholdersEquityNoteWarrantsOrRightsTextBlock_36A8477EDD74BD4B20D46D888E58684F" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ScheduleOfStockholdersEquityNoteWarrantsOrRightsTextBlock_36A8477EDD74BD4B20D46D888E58684F" xlink:to="lab_us-gaap_ScheduleOfStockholdersEquityNoteWarrantsOrRightsTextBlock_36A8477EDD74BD4B20D46D888E58684F" xlink:type="arc" />
    <link:label id="lab_us-gaap_StockholdersEquityNoteDisclosureTextBlock_C604429D111B50CCF7686D888E8107E5_verboseLabel_en-US" xlink:label="lab_us-gaap_StockholdersEquityNoteDisclosureTextBlock_C604429D111B50CCF7686D888E8107E5" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Warrants</link:label>
    <link:label id="lab_us-gaap_StockholdersEquityNoteDisclosureTextBlock_C604429D111B50CCF7686D888E8107E5_label_en-US" xlink:label="lab_us-gaap_StockholdersEquityNoteDisclosureTextBlock_C604429D111B50CCF7686D888E8107E5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Stockholders' Equity Note Disclosure [Text Block]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2015/elts/us-gaap-2015-01-31.xsd#us-gaap_StockholdersEquityNoteDisclosureTextBlock" xlink:label="loc_us-gaap_StockholdersEquityNoteDisclosureTextBlock_C604429D111B50CCF7686D888E8107E5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_StockholdersEquityNoteDisclosureTextBlock_C604429D111B50CCF7686D888E8107E5" xlink:to="lab_us-gaap_StockholdersEquityNoteDisclosureTextBlock_C604429D111B50CCF7686D888E8107E5" xlink:type="arc" />
  </link:labelLink>
</link:linkbase>
