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Inventories - Components of Inventories (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Components of Inventories |  |
Raw materials | $ 2,737 | $ 3,362
Finished goods | 5,669 | 5,365
Inventories | $ 8,406 | $ 8,727

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