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Geographic Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenue $ 1,944 $ 1,734
Net loss (14,342) (19,387)
Assets 24,764 29,387
Long Lived Assets, net 198 387
United Kingdom    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenue 1,944 1,734
Net loss (11,822) (16,541)
Assets 7,565 10,293
Long Lived Assets, net 194 381
United States    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net loss (2,520) (2,846)
Assets 17,199 19,094
Long Lived Assets, net   6
United States | Continuing operations    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net loss (2,520) (2,865)
Assets 17,124 18,923
Long Lived Assets, net $ 4 6
United States | Discontinued operations    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net loss 19
Assets $ 75 $ 171
Long Lived Assets, net