Quarterly report pursuant to Section 13 or 15(d)

Property and Equipment - Schedule of Property and Equipment (Detail)

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Property and Equipment - Schedule of Property and Equipment (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 59,872 $ 45,474
Less accumulated depreciation and amortization (1,678) (1,345)
Property and equipment, net 58,194 44,129
Construction in Progress    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 55,083 40,797
Lab Equipment    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 2,156 2,156
Machinery Equipment    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 885 885
Leasehold Improvements    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 623 623
Furniture and Fixtures    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 536 536
Computer Equipment and Software    
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 589 $ 477