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Inventories (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 5,534 $ 279
Work in process 18,349 14,395
Finished goods 2,594 2,844
Total inventories 26,477 17,518
Inventories 2,672 7,873
Prepaid and other long-term assets $ 23,805 $ 9,645