Represents the development and regulatory milestones payments which the entity may be obligated to pay under certain contractual agreements.

No definition available.

Name:	ptct_DevelopmentAndRegulatoryMilestonePaymentObligations
Namespace Prefix:	ptct_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Commitments and contingencies (Details) - Funding agreement - Wellcome trust - USD ($) $ in Millions	Sep. 30, 2017	Jun. 30, 2016
Other Commitments [Abstract]
Development and regulatory milestone payments which the entity may be obligated to pay		$ 0.8
Maximum
Other Commitments [Abstract]
Development and regulatory milestone payments which the entity may be obligated to pay	$ 22.4