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Balance Sheet Account Detail (Inventories) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Balance Sheet Related Disclosures [Abstract]    
Raw materials $ 5,165 $ 5,362
Work-in-process 4,463 4,132
Finished goods 14,858 16,911
Total Inventories $ 24,486 $ 26,405