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Financial Statement Details - Property, Plant and Equipment, Net (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross $ 82,193 $ 81,029
Accumulated depreciation (5,367) (4,303)
Property, plant and equipment, net 76,826 76,726
Construction in Progress    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross 43,339 42,281
Buildings    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross 23,811 23,811
Equipment    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross 9,702 9,625
Leasehold Improvements    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross 3,967 3,918
Software    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross 1,095 1,092
Furniture And Fixtures    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross $ 279 $ 302