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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
Marketable securities on the balance sheet
Total Marketable securities, Less Than 12 Months	$ 163,761us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	$ 69,157us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
Total Marketable securities, More Than 12 Months	101,732ptct_AvailableForSaleSecuritiesDebtMaturitiesOverOneYearFairValue	57,896ptct_AvailableForSaleSecuritiesDebtMaturitiesOverOneYearFairValue
Commercial paper
Marketable securities on the balance sheet
Total Marketable securities, Less Than 12 Months		14,998us-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	157,758us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue / us-gaap_InvestmentTypeAxis = us-gaap_DomesticCorporateDebtSecuritiesMember	54,159us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue / us-gaap_InvestmentTypeAxis = us-gaap_DomesticCorporateDebtSecuritiesMember
Total Marketable securities, More Than 12 Months	72,273ptct_AvailableForSaleSecuritiesDebtMaturitiesOverOneYearFairValue / us-gaap_InvestmentTypeAxis = us-gaap_DomesticCorporateDebtSecuritiesMember	57,896ptct_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	6,003us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue / us-gaap_InvestmentTypeAxis = us-gaap_OtherDebtSecuritiesMember
Total Marketable securities, More Than 12 Months	$ 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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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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