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Subsequent events Narrative (Details) $ in Millions	1 Months Ended
	Oct. 31, 2020 USD ($)
Subsequent Event
Subsequent Event [Line Items]
Milestone payable to the company	$ 7.5

X

- Definition

Amount of milestone triggered and payable to the entity.

+ References

No definition available.

+ Details

Name:	ptct_MilestonePaymentDue
Namespace Prefix:	ptct_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- 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

X

- Details

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