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Summary of significant accounting policies - Inventory (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Accounting Policies [Abstract] |  |
Raw materials | $ 874 | $ 1,431
Work in progress | 9,652 | 9,324
Finished goods | 8,759 | 5,362
Total inventory | $ 19,285 | $ 16,117

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