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Nature of Business and Summary of Significant Accounting Policies - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Accounting Policies [Abstract]    
Raw Materials & Supplies $ 3,389 $ 624
Work-in-process 9,949 6,198
Finished Goods 6,359 4,874
Inventory Reserve (2,254) (384)
Total Inventories $ 17,443 $ 11,312