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Inventories - Schedule of Inventory (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Finished goods $ 9,766 $ 5,439
Raw materials 13,227 5,502
Total inventories 22,993 10,941
Current portion 13,657 10,941
Long-term portion $ 9,336 $ 0