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Inventories - Inventories (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]    
Raw materials $ 513 $ 594
Work-in-process 728 791
Inventory, Gross 1,241 1,385
Less: allowance (60) (60)
Total inventories $ 1,181 $ 1,325