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Inventories - Summary of Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Inventories    
Finished goods $ 8,042 $ 7,513
Work-in-process 13,684 9,596
Raw materials 21,552 17,680
Less: Inventory reserves (7,184) (6,137)
Inventories, net $ 36,094 $ 28,652