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    <link:label id="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_CE4D3F7C155685E61A6536E823C10414_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_CE4D3F7C155685E61A6536E823C10414" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Purchases of property and equipment</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_7C09C51A2291DD141FAB36E823C12C0D_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_7C09C51A2291DD141FAB36E823C12C0D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Investing Activities</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_6A83280E6A07DD02B2C736E823C159A8_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_6A83280E6A07DD02B2C736E823C159A8" 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_NetCashProvidedByUsedInFinancingActivities_6A83280E6A07DD02B2C736E823C159A8_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivities_6A83280E6A07DD02B2C736E823C159A8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Financing Activities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_6A83280E6A07DD02B2C736E823C159A8" xlink:type="locator" />
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    <link:label id="lab_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_27D57886299F70C4048736E823C1AAFC_totalLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_27D57886299F70C4048736E823C1AAFC" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net increase in cash</link:label>
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