Equity - Narrative (Details) $ in Thousands	1 Months Ended		12 Months Ended
Equity - Narrative (Details) $ in Thousands	Apr. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2025 vote shares	Dec. 31, 2024 USD ($) pence shares	Jun. 24, 2024 shares	Jun. 06, 2024 pence £ / shares shares	Feb. 29, 2024 shares	Dec. 31, 2023 shares	Dec. 31, 2022 shares	May 09, 2022 USD ($) tranche pence	Jun. 18, 2015 shares
Equity - Acquired Share capital PureTech LLC [Line Items]
Number of votes per ordinary share \| vote			1
Repurchase and cancellation of ordinary shares from Tender Offer \| $				$ (104,844)
Purchase of treasury stock (in shares)				18,506,177
Share Capital
Equity - Acquired Share capital PureTech LLC [Line Items]
Repurchase and cancellation of ordinary shares from Tender Offer \| $				$ (600)
Number of shares issued (in shares)			(257,927,489)	(257,927,489)				(289,468,159)	(289,161,653)
Common
Equity - Acquired Share capital PureTech LLC [Line Items]
Value of shares authorized to be repurchased \| $										$ 50,000
Repurchase price per share \| pence										1
Number of tranches \| tranche										2
Aggregated number of shares repurchased under share repurchase program (in shares)					31,540,670		20,182,863
Number of shares acquired						33,500,000
Fixed price \| pence				767,533		250
Number of shares acquired per share (in euro per share) \| £ / shares						£ 25.00
Number of shares issued (in shares)			(257,927,489)	(257,927,489)
Purchase of treasury stock (in shares)			16,243,451	18,506,177
Common \| Jefferies International Limited
Equity - Acquired Share capital PureTech LLC [Line Items]
Value of shares authorized to be repurchased \| $										$ 25,000
Common \| PureTech Health LLC
Equity - Acquired Share capital PureTech LLC [Line Items]
Issued share capital acquired (in shares)											159,648,387
Series A-2 Preferred Shares
Equity - Acquired Share capital PureTech LLC [Line Items]
Proceeds from the issuance of shares and subsidiary preferred shares \| $	$ 100,100	$ 100,000