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Summary of significant accounting policies - Inventory (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Accounting Policies [Abstract] |  |  |  |
Raw materials |  | $ 907 |  | $ 1,078
Work in progress |  | 24,595 |  | 14,074
Finished goods |  | 10,250 |  | 6,656
Total inventory |  | 35,752 |  | $ 21,808
Inventory write-down | $ 300 | $ 400 | $ 1,200 |

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