Name:	ptct_ClearpointEquityInvestmentFvniUnrealizedGainLoss
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Amount of investment in equity security of ClearPoint Neuro, Inc. measured at fair value with change in fair value recognized in net income (FV-NI).

No definition available.

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

Amount of investment in marketable equity investments and convertible debt securities measured at fair value.

No definition available.

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

Amount of cash outflow for purchase of marketable equity investments and convertible debt securities.

No definition available.

Name:	ptct_MarketableEquityInvestmentsAndConvertibleDebtSecuritiesPurchases
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Data Type:	xbrli:monetaryItemType
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Amount of unrealized gain (loss) on marketable equity investments and convertible debt securities measured at fair value with change in fair value recognized in net income (FV-NI).

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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Amount of unrealized gain (loss) from foreign currency transaction on marketable equity investments and convertible debt securities.

No definition available.

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Data Type:	xbrli:monetaryItemType
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Amount of unrealized gain (loss) from foreign currency transaction on marketable securities.

No definition available.

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Data Type:	xbrli:monetaryItemType
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The cash inflow associated with the aggregate amount received by the entity through sale or redemption of marketable equity investments and convertible debt securities during the period.

No definition available.

Name:	ptct_ProceedsFromSaleAndRedemptionOfMarketableEquityInvestmentsAndConvertibleDebtSecurities
Namespace Prefix:	ptct_
Data Type:	xbrli:monetaryItemType
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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482736/825-10-45-1A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483467/210-10-45-1

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(3)(d)(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 321
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479536/321-10-50-4

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Amount of cash outflow for purchase of marketable security.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481830/320-10-45-11

Name:	us-gaap_PaymentsToAcquireMarketableSecurities
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Data Type:	xbrli:monetaryItemType
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The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period.

No definition available.