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Accounts payable and accrued expenses - Restructuring (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Restructuring costs
Accrued restructuring costs	$ 0.0	$ 0.1

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

X

- References

No definition available.

+ Details

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