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Inventories (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Inventories |  |
Raw materials | $ 23,009 | $ 16,492
Finished goods | 4,635 | 5,047
Inventory reserve | (2,848) | (1,347)
Inventory | $ 24,796 | $ 20,192

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