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Capitalization - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023	Aug. 31, 2019
Common stock
Common stock, authorized shares (in shares)	250,000,000		250,000,000		250,000,000
Sales Agreement
Common stock
Number of shares issued in transaction (in shares)	0	0	0	0
Sales Agreement | Maximum
Common stock
Value of shares available to be issued and sold in transaction						$ 125.0
Aggregate value of remaining shares to be issued and sold			$ 93.0

X

- Definition

The aggregate value of remaining shares to be issued and sold under a sales agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	ptct_
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Balance Type:	debit
Period Type:	duration

X

- Definition

Value of shares available to be issued and sold in stock transaction.

+ References

No definition available.

+ Details

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X

- Definition

The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-04(16)(a))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479170/946-210-S99-1

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X

- Definition

The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

+ References

No definition available.

+ Details

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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- Details

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