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Nature of Business and Summary of Significant Accounting Policies - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]    
Raw Materials & Supplies $ 978 $ 443
Work-in-process 1,660 1,216
Finished Goods 730 899
Total Inventories $ 3,368 $ 2,558