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Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Raw materials $ 5,322 $ 6,544
Work-in-process 2,900 3,660
Finished goods 4,609 3,837
Total inventories 12,831 14,041
Reserve for inventory $ 200 $ 200