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Summary of significant accounting policies - Inventory (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Accounting Policies [Abstract]
Raw materials	$ 1,382		$ 1,382		$ 1,418
Work in progress	7,034		7,034		7,721
Finished goods	6,588		6,588		6,717
Total inventory	15,004		15,004		$ 15,856
Inventory write-down	$ 300	$ 300	$ 900	$ 1,700

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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