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Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 4,018 $ 1,291
Work-in-process 3,320 3,485
Finished goods 3,057 3,614
Total inventories 10,395 8,390
Reserve for inventory $ 200 $ 200