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Inventories - Schedule of Inventories (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Raw materials $ 7,479 $ 9,587
Work-in-process 10,618 14,027
Finished products 35,242 20,712
Field/consignment 29,405 38,071
Inventories $ 82,744 $ 82,397