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Inventories (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Summary of inventories |  |
Raw materials | $ 2,010 | $ 1,532
Work-in-progress | 5,687 | 3,590
Finished goods | 77,624 | 59,328
Total inventory | $ 85,321 | $ 64,450

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