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Inventory - Inventory (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]    
Raw materials $ 2,630 $ 3,236
Work-in-process 6,632 6,087
Finished goods 1,000 2,023
Total inventory $ 10,262 $ 11,346