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Summary of significant accounting policies - Inventory (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Accounting Policies [Abstract]
Raw materials	$ 1,418	$ 824
Work in progress	7,721	8,745
Finished goods	6,717	9,128
Total inventory	15,856	18,697
Inventory write-down	$ 2,200	$ 500

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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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