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Property Plant and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 902 $ 844
Accumulated depreciation and amortization (839) (816)
Property, plant and equipment, net 63 28
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 156 156
Computer equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 63 63
Furniture and Fixtures    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 66 66
Software    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 617 $ 559