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Summary of significant accounting policies - Inventory (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Raw materials	$ 1,853	$ 1,431
Work in progress	10,870	9,324
Finished goods	4,384	5,362
Total inventory	$ 17,107	$ 16,117

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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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