Share based compensation - Compensation expense recognized (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Share based compensation
Total compensation expense recognized	$ 13,341	$ 19,056	$ 24,866
Selling, general and administrative expenses
Share based compensation
Total compensation expense recognized	11,693	16,836	20,895
Research and development expenses
Share based compensation
Total compensation expense recognized	$ 1,648	$ 2,220	$ 3,971

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details