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Capitalization - Narrative (Details) - Sales Agreement - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Aug. 31, 2019
Common stock |  |  |  |  |
Number of shares issued in transaction (in shares) | 0 | 0 | 0 | 0 |
Maximum |  |  |  |  |
Common stock |  |  |  |  |
Value of shares available to be issued and sold in transaction |  |  |  |  | $ 125.0
Aggregate value of remaining shares to be issued and sold |  |  | $ 93.0 |  |

X
- Definition The aggregate value of remaining shares to be issued and sold under a sales agreement. + References No definition available. + Details
Name: | ptct_SaleOfStockRemainingSharesAvailableForSaleAggregateOfferingValue
Namespace Prefix: | ptct_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Value of shares available to be issued and sold in stock transaction. + References No definition available. + Details
Name: | ptct_SaleOfStockSharesAvailableToBeIssuedAndSoldValue
Namespace Prefix: | ptct_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The number of shares issued or sold by the subsidiary or equity method investee per stock transaction. + References No definition available. + Details
Name: | us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ScheduleOfCapitalizationEquityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=ptct_AtMarketOfferingSalesAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |