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Collaboration arrangements and concentration of credit risk - Amounts owed by BMS (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Total revenues $ 106,483 $ 524,002 $ 37,514
BMS arrangement      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Amounts owed in relation to the collaboration services 136 914  
Total revenues 1,752 4,176 37,514
BMS arrangement | Bristol Myers Squibb      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Amounts owed in relation to the collaboration services 136 914  
Total revenues $ 1,752 $ 4,176 $ 37,514