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Inventories - Schedule of Inventories (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Inventory Disclosure [Abstract]    
Raw materials $ 7,992 $ 8,442
Work-in-process 14,977 12,149
Finished products 17,164 29,142
Field/consignment 44,545 34,902
Inventories $ 84,678 $ 84,635