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Inventories - Schedule of Inventories (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 9,587 $ 8,463
Work-in-process 14,027 13,478
Finished products 20,712 18,244
Field/consignment 38,071 36,662
Inventories $ 82,397 $ 76,847