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Inventories - Inventories (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Inventory Disclosure [Abstract]    
Raw materials $ 594 $ 940
Work-in-process 791 1,902
Inventory, Gross 1,385 2,842
Less: allowance (60) (73)
Total inventories $ 1,325 $ 2,769