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Debt - Liability for Sale of Future Royalties (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jul. 17, 2020 | Sep. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019
Debt Disclosure [Abstract] |  |  |  |
Proceeds from sale of future royalties | $ 650,000 |  | $ 650,000 | $ 0
Proceeds from the sale of future royalties |  | $ 650,000 | 650,000 |
Less: Non-cash royalty revenue payable to RPI |  | (299) | (299) |
Plus: non-cash interest expense recognized |  | 14,557 | 14,557 |
Ending balance |  | $ 664,258 | $ 664,258 |
Effective interest rate of the liability component | 11.00% | 11.00% | 11.00% |

X
- Definition Amount of liabilities related to the sale of future royalties. + References No definition available. + Details
Name: | ptct_LiabilitySaleOfFutureRoyalties
Namespace Prefix: | ptct_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of interest expense recognized related to the liability for the sale of future royalties per terms of the agreement. + References No definition available. + Details
Name: | ptct_LiabilitySaleOfFutureRoyaltiesInterestExpense
Namespace Prefix: | ptct_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of obligation incurred from the sale of future royalties during the period. + References No definition available. + Details
Name: | ptct_LiabilitySaleOfFutureRoyaltiesObligationIncurred
Namespace Prefix: | ptct_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of royalty revenue recognized during the period relating to the sale of future royalties payable under terms of the agreement. + References No definition available. + Details
Name: | ptct_LiabilitySaleOfFutureRoyaltiesRoyaltyRevenuePayable
Namespace Prefix: | ptct_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- References No definition available. + Details
Name: | us-gaap_DebtDisclosureAbstract
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Data Type: | xbrli:stringItemType
Balance Type: | na
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X
- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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