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Inventories - Schedule of Inventories (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Raw materials $ 8,442 $ 9,587
Work-in-process 12,149 14,027
Finished products 29,142 20,712
Field/consignment 34,902 38,071
Inventories $ 84,635 $ 82,397