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Inventory - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]    
Raw materials & supplies $ 995 $ 443
Work-in-process 1,979 1,216
Finished goods 1,044 899
Total inventories $ 4,018 $ 2,558