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Inventory (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Raw materials  $ 3,497 $ 624
Work-in-process 10,025 6,198
Finished goods 5,452 4,874
Obsolescence reserve (87) (384)
Total inventories $ 18,887 $ 11,312