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Property and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 2,299 $ 2,304
Less accumulated depreciation and amortization (2,023) (1,860)
Property and equipment, net 276 444
Software    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 147 144
Furniture    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 317 317
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 1,598 1,613
Computer equipment    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 237 $ 230