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Property and Equipment, Net - Schedule of Property and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment, Gross $ 539 $ 635
Accumulated depreciation and amortization 400 421
Property and equipment, net 139 214
Computer Hardware And Software [Member]    
Property, Plant and Equipment, Gross 55 78
Accumulated depreciation and amortization $ 55 61
Computer Hardware And Software [Member] | Minimum [Member]    
Estimated Useful Life (in years) 3 years  
Computer Hardware And Software [Member] | Maximum [Member]    
Estimated Useful Life (in years) 5 years  
Equipment [Member]    
Estimated Useful Life (in years) 7 years  
Property, Plant and Equipment, Gross $ 145 218
Accumulated depreciation and amortization 96 159
Leasehold Improvements [Member]    
Property, Plant and Equipment, Gross 339 339
Accumulated depreciation and amortization $ 249 $ 201