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Fair value of financial instruments and marketable securities (Details 3) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Marketable securities on the balance sheet |  |
Total Marketable securities, Less Than 12 Months | $ 169,392 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue | $ 163,761 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
Total Marketable securities, More Than 12 Months | 74,250 ptct_AvailableForSaleSecuritiesDebtMaturitiesOverOneYearFairValue | 101,732 ptct_AvailableForSaleSecuritiesDebtMaturitiesOverOneYearFairValue
Commercial paper |  |
Marketable securities on the balance sheet |  |
Total Marketable securities, Less Than 12 Months | 19,774 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue / us-gaap_InvestmentTypeAxis = us-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMember |
Corporate debt securities |  |
Marketable securities on the balance sheet |  |
Total Marketable securities, Less Than 12 Months | 138,306 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember | 157,758 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember
Total Marketable securities, More Than 12 Months | 48,228 ptct_AvailableForSaleSecuritiesDebtMaturitiesOverOneYearFairValue / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember | 72,273 ptct_AvailableForSaleSecuritiesDebtMaturitiesOverOneYearFairValue / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember
Government obligations |  |
Marketable securities on the balance sheet |  |
Total Marketable securities, Less Than 12 Months | 11,312 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue / us-gaap_InvestmentTypeAxis = us-gaap_OtherDebtSecuritiesMember | 6,003 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue / us-gaap_InvestmentTypeAxis = us-gaap_OtherDebtSecuritiesMember
Total Marketable securities, More Than 12 Months | $ 26,022 ptct_AvailableForSaleSecuritiesDebtMaturitiesOverOneYearFairValue / us-gaap_InvestmentTypeAxis = us-gaap_OtherDebtSecuritiesMember | $ 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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