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Inventory - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Raw materials & supplies $ 1,854 $ 978
Work-in-process 2,526 1,660
Finished goods 3,765 730
Total inventories $ 8,145 $ 3,368