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Geographic Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenue $ 843 $ 1,944
Net loss (11,791) (14,342)
Assets 19,662 24,764
Long Lived Assets, net 45 198
United States    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net loss (2,211) (2,520)
Assets 15,197 17,199
Long Lived Assets, net 2 4
United Kingdom    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenue 843 1,944
Net loss (9,580) (11,822)
Assets 4,465 7,565
Long Lived Assets, net $ 43 $ 194