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v3.20.2

Summary of significant accounting policies - Liability for Sale of Future Royalties (Details) - USD ($) $ in Thousands |  | 9 Months Ended
--- | --- | ---
Jul. 17, 2020 | Sep. 30, 2020 | Sep. 30, 2019
Assigned royalty payments |  |  |
Cash consideration received from Royalty Purchase Agreement | $ 650,000 | $ 650,000 | $ 0
Assigned royalty payment, retained percentage | 57.067% |  |
Revenue recognition, milestone, potential achievements | $ 362,500 |  |
Royalty Purchase Agreement | Assigned Royalty Payments |  |  |
Assigned royalty payments |  |  |
Assigned royalty payment, percentage | 42.933% |  |
Cash consideration received from Royalty Purchase Agreement | $ 650,000 |  |
Royalty purchase agreement, termination period | 60 days |  |
Royalty purchase agreement, payment maximum | $ 1,300,000 |  |

X
- Definition Assigned Royalty Payment, Percentage + References No definition available. + Details
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Namespace Prefix: | ptct_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Assigned Royalty Payment, Retained Percentage + References No definition available. + Details
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Namespace Prefix: | ptct_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Cash received for sale of future royalties during the current period. + References No definition available. + Details
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Namespace Prefix: | ptct_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Revenue Recognition, Milestone, Potential Achievements + References No definition available. + Details
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Namespace Prefix: | ptct_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Royalty Purchase Agreement, Payment Maximum + References No definition available. + Details
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Namespace Prefix: | ptct_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Royalty Purchase Agreement, Termination Period + References No definition available. + Details
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Namespace Prefix: | ptct_
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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |