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v3.8.0.1

Subsequent events (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Oct. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Subsequent Event [Line Items] |  |  |  |  |
Collaboration and grant revenue |  | $ 73 | $ 973 | $ 249 | $ 1,186
Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Collaboration and grant revenue | $ 20,000 |  |  |  |

X
- Definition Amount of revenue earned from collaborative research and development and licensing agreements and non-repayable sum of money awarded to an entity to carry out a specific purpose as provided in grant agreements. + References No definition available. + Details
Name: | ptct_CollaborationAndGrantRevenue
Namespace Prefix: | ptct_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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: |