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Inventory - Schedule of Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 3,787 $ 3,858
Work-in-process 12,123 13,671
Finished goods 25,309 27,196
Total inventory $ 41,219 $ 44,725