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Property and equipment, net - Property and Equipment, Net (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Total cost of property and equipment $ 3,156 $ 2,052
Less: accumulated depreciation and amortization (1,378) (702)
Property and equipment, net 1,778 1,350
Computer and Network Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total cost of property and equipment 1,035 918
Furniture, Fixtures and Office Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total cost of property and equipment 1,046 624
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total cost of property and equipment $ 1,075 $ 510