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Business combinations - Acquisition-related costs (Details) - TCR2 Therapeutics - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2023
Dec. 31, 2023
Business Acquisition [Line Items]    
Legal, professional and accounting fees $ 4,993 $ 5,174
Bankers' fees 2,172 2,172
Total acquisition-related costs 7,165 $ 7,346
Issuance costs incurred relating to the issuance of shares to TCR2 stockholders $ 0