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Inventories (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 279  
Work in process 14,395 $ 1,032
Finished goods 2,844 67
Total inventories 17,518 1,099
Inventories 7,873 1,099
Prepaid and other long-term assets $ 9,645 $ 0