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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

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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

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

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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