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Subsequent events - Narrative (Details) - Subsequent Event - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended
--- | --- | ---
Jan. 31, 2019 | Feb. 28, 2019
Subsequent Event [Line Items] |  |
Common stock, issued and sold (in shares) | 7,563,725 |
Sale price (in USD per share) | $ 30.20 |
Exercise of Underwriter (in shares) |  | 843,725
Net proceeds from sale of stock | $ 224.1 |

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- Definition Sale of Stock, Exercise of Underwriter Option + References No definition available. + Details
Name: | ptct_SaleofStockExerciseofUnderwriterOption
Namespace Prefix: | ptct_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Cash received on stock transaction after deduction of issuance costs. + References No definition available. + Details
Name: | us-gaap_SaleOfStockConsiderationReceivedOnTransaction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- 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

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- Definition Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction. + References No definition available. + Details
Name: | us-gaap_SaleOfStockPricePerShare
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |