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Summary of significant accounting policies - Inventory (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Accounting Policies [Abstract]    
Raw materials $ 2,089 $ 1,431
Work in progress 8,341 9,324
Finished goods 6,467 5,362
Total inventory $ 16,897 $ 16,117