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Accounts payable and accrued expenses - Restructuring (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Restructuring costs |  |
Accrued restructuring costs | $ 0.7 | $ 9.0

X
- Definition Represents the carrying value as of the balance sheet date of obligations incurred through that date and payable for restructuring costs. + References No definition available. + Details
Name: | ptct_AccruedRestructuringCosts
Namespace Prefix: | ptct_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_RestructuringChargesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration