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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]            
Finished goods $ 5,030   $ 10,087      
Semi-finished goods and work-in-process 28,919   28,815      
Raw materials 5,743   8,449      
Materials in-transit 444          
Less: inventory reserve (6,505) $ (5,307) (5,947) $ (11,328) $ (11,782) $ (4,845)
Inventories, net $ 33,631   $ 41,404