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Summary of Significant Accounting Policies (Change in Level 3 Liability) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Accounting Policies [Abstract]  
Warrant liability at December 31, 2016 $ 6,727,409
Increase in fair value of warrant liability 4,738,753
Warrant liability at December 31, 2017 $ 11,466,162