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Summary of Significant Accounting Policies (Detail Textuals)
£ in Thousands
9 Months Ended
Sep. 30, 2017
USD ($)
Segment
Sep. 30, 2017
GBP (£)
Dec. 31, 2016
USD ($)
Segment
Sep. 30, 2016
USD ($)
Dec. 30, 2015
USD ($)
Accounting Policies [Abstract]          
Cash and cash equivalents $ 26,025,000   $ 16,520,000 $ 18,029,000 $ 20,440,000
Number of operating segments | Segment 1        
Number of geographic areas for development operations | Segment     2    
Cash balances insured by FDIC $ 250,000        
Cash exceeding balance insured by FDIC 24,300,000        
Cash insured by the financial services compensation scheme | £   £ 75,000      
Cash exceeding balance insured by FSCS $ 1,400,000