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Inventories - Inventories (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 669 $ 519
Work-in-process 1,344 886
Inventory, Gross 2,013 1,405
Less: allowance (77) (78)
Total inventories $ 1,936 $ 1,327