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Summary of significant accounting policies - Inventory (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Accounting Policies [Abstract]
Raw materials	$ 1,501		$ 1,418
Work in progress	8,070		7,721
Finished goods	5,710		6,717
Total inventory	15,281		$ 15,856
Inventory write-down	$ 600	$ 1,400

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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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