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Inventories - Inventories (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Raw materials $ 595 $ 513
Work-in-process 708 728
Inventory, Gross 1,303 1,241
Less: allowance (134) (60)
Total inventories $ 1,169 $ 1,181