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Commitments and contingencies (Details) - Funding agreement - Wellcome trust $ in Millions	Mar. 31, 2017 USD ($)
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

X

- Definition

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

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_TypeOfArrangementAxis=us-gaap_CollaborativeArrangementProductAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CounterpartyNameAxis=ptct_WellcomeTrustLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: