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Summary of significant accounting policies - Inventory (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Raw materials	$ 727	$ 452
Work in progress	4,712	3,912
Finished goods	8,413	6,390
Total inventory	$ 13,852	$ 10,754

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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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