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Fair Value of Financial INstruments - Change in Level 3 Liability (Details)
6 Months Ended
Jun. 30, 2018
USD ($)
Fair Value Disclosures [Abstract]  
Warrant liability at December 31, 2017 $ 11,466,162
Increase in fair value of warrant liability 2,942,829
Warrant liability at June 30, 2018 $ 14,408,991