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Property and Equipment, Net - Schedule of Property and Equipment, Net (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Property Plant And Equipment [Line Items]    
Property and equipment gross $ 49,431 $ 31,751
Less accumulated depreciation (9,500) (4,417)
Property and equipment, net 39,931 27,334
Furniture and Equipment [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment gross 20,300 13,626
Software [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment gross 435 108
Leasehold Improvements [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment gross 27,342 16,029
Fixed Assets in Progress [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment gross $ 1,354 $ 1,988