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Geographic Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenue $ 0 $ 843
Net loss (7,470) (11,791)
Assets 26,003 19,662
Long Lived Assets, net 29 45
United Kingdom    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenue 0 843
Net loss (7,343) (9,580)
Assets 2,481 4,465
Long Lived Assets, net 29 43
United States    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net loss (127) (2,211)
Assets 23,522 15,197
Long Lived Assets, net $ 0 $ 2