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Summary of significant accounting policies - Inventory (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Raw materials	$ 877	$ 874
Work in progress	8,666	9,652
Finished goods	8,830	8,759
Total inventory	$ 18,373	$ 19,285

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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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