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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
Marketable securities on the balance sheet
Total Marketable securities, Less Than 12 Months	$ 169,392us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	$ 163,761us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
Total Marketable securities, More Than 12 Months	74,250ptct_AvailableForSaleSecuritiesDebtMaturitiesOverOneYearFairValue	101,732ptct_AvailableForSaleSecuritiesDebtMaturitiesOverOneYearFairValue
Commercial paper
Marketable securities on the balance sheet
Total Marketable securities, Less Than 12 Months	19,774us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue / us-gaap_InvestmentTypeAxis = us-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMember
Corporate debt securities
Marketable securities on the balance sheet
Total Marketable securities, Less Than 12 Months	138,306us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember	157,758us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember
Total Marketable securities, More Than 12 Months	48,228ptct_AvailableForSaleSecuritiesDebtMaturitiesOverOneYearFairValue / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember	72,273ptct_AvailableForSaleSecuritiesDebtMaturitiesOverOneYearFairValue / us-gaap_InvestmentTypeAxis = us-gaap_CorporateDebtSecuritiesMember
Government obligations
Marketable securities on the balance sheet
Total Marketable securities, Less Than 12 Months	11,312us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue / us-gaap_InvestmentTypeAxis = us-gaap_OtherDebtSecuritiesMember	6,003us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue / us-gaap_InvestmentTypeAxis = us-gaap_OtherDebtSecuritiesMember
Total Marketable securities, More Than 12 Months	$ 26,022ptct_AvailableForSaleSecuritiesDebtMaturitiesOverOneYearFairValue / us-gaap_InvestmentTypeAxis = us-gaap_OtherDebtSecuritiesMember	$ 29,459ptct_AvailableForSaleSecuritiesDebtMaturitiesOverOneYearFairValue / us-gaap_InvestmentTypeAxis = us-gaap_OtherDebtSecuritiesMember

X

- 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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Namespace Prefix:	ptct_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- 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

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- Details

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X

- Details

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X

- Details

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