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Fair Value of Financial INstruments (Tables)
9 Months Ended
Sep. 30, 2019
Fair Value Disclosures [Abstract]  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation
The following table presents changes in the liability-classified warrant measured at fair value using Level 3 inputs:

 
Fair Value Measurements of Level 3 liability-classified warrant
Warrant liability at December 31, 2018
$
12,380,939

Decrease in fair value of warrant liability
(4,774,711
)
Exercise of warrants
(1,172,801
)
Warrant liability at September 30, 2019
$
6,433,427