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Inventories (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 738  
Work in process 13,687 $ 1,032
Finished goods 25 67
Total inventories 14,450 1,099
Inventories 6,123 $ 1,099
Prepaid and other long-term assets $ 8,327