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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 |

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

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- 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: |