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Inventory (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Raw materials $ 4,304 $ 4,093
Work in process 569 0
Finished goods 1,129 1,230
Total inventories $ 6,002 $ 5,323
Finished goods shelf life 36 months