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Inventories - Inventories (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Raw materials $ 519 $ 513
Work-in-process 886 728
Inventory, Gross 1,405 1,241
Less: allowance (78) (60)
Total inventories $ 1,327 $ 1,181