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Nature of Business and Summary of Significant Accounting Policies - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw Materials & Supplies $ 624 $ 645
Work-in-process 6,198 2,093
Finished Goods 4,874 2,855
Finished Goods Reserve (384) (187)
Total Inventories $ 11,312 $ 5,406