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Inventories (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Summary of inventories |  |
Raw materials | $ 1,538 | $ 1,925
Work-in-progress | 4,619 | 3,582
Finished goods | 107,214 | 94,330
Total inventory | $ 113,371 | $ 99,837

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