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Inventories - Inventories (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]    
Raw materials $ 636 $ 594
Work-in-process 407 791
Inventory, Gross 1,043 1,385
Less: allowance (78) (60)
Total inventories $ 965 $ 1,325