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Fair value of financial instruments and investments (Details 3) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Marketable securities on the balance sheet |  |
Total Marketable securities, Less Than 12 Months | $ 163,761 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue | $ 69,157 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
Total Marketable securities, More Than 12 Months | 101,732 ptct_AvailableForSaleSecuritiesDebtMaturitiesOverOneYearFairValue | 57,896 ptct_AvailableForSaleSecuritiesDebtMaturitiesOverOneYearFairValue
Commercial paper |  |
Marketable securities on the balance sheet |  |
Total Marketable securities, Less Than 12 Months |  | 14,998 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue / us-gaap_InvestmentTypeAxis = us-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMember
U.S. corporate debt securities |  |
Marketable securities on the balance sheet |  |
Total Marketable securities, Less Than 12 Months | 157,758 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue / us-gaap_InvestmentTypeAxis = us-gaap_DomesticCorporateDebtSecuritiesMember | 54,159 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue / us-gaap_InvestmentTypeAxis = us-gaap_DomesticCorporateDebtSecuritiesMember
Total Marketable securities, More Than 12 Months | 72,273 ptct_AvailableForSaleSecuritiesDebtMaturitiesOverOneYearFairValue / us-gaap_InvestmentTypeAxis = us-gaap_DomesticCorporateDebtSecuritiesMember | 57,896 ptct_AvailableForSaleSecuritiesDebtMaturitiesOverOneYearFairValue / us-gaap_InvestmentTypeAxis = us-gaap_DomesticCorporateDebtSecuritiesMember
Government Agencies Debt Securities [Member] |  |
Marketable securities on the balance sheet |  |
Total Marketable securities, Less Than 12 Months | 6,003 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue / us-gaap_InvestmentTypeAxis = us-gaap_OtherDebtSecuritiesMember |
Total Marketable securities, More Than 12 Months | $ 29,459 ptct_AvailableForSaleSecuritiesDebtMaturitiesOverOneYearFairValue / us-gaap_InvestmentTypeAxis = us-gaap_OtherDebtSecuritiesMember |

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- Definition Amount of available-for-sale debt securities at fair value maturing after the next fiscal year following the latest fiscal year. + References No definition available. + Details
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- Definition Fair value of available-for-sale debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Details
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