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Inventories - Schedule of Inventories (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Raw materials $ 7,779 $ 9,587
Work-in-process 12,050 14,027
Finished products 26,384 20,712
Field/consignment 36,646 38,071
Inventories $ 82,859 $ 82,397