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Property and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 671 $ 2,299
Less accumulated depreciation and amortization (285) (2,023)
Property and equipment, net 386 276
Software    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 139 147
Furniture    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 226 317
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 84 1,598
Computer equipment    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 222 $ 237