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Summary of significant accounting policies - Inventory (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Accounting Policies [Abstract]          
Raw materials $ 1,107   $ 1,107   $ 1,078
Work in progress 20,873   20,873   14,074
Finished goods 10,038   10,038   6,656
Total inventory 32,018   32,018   $ 21,808
Inventory write-down $ 300 $ 300 $ 400 $ 900