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Common Stock Purchase Warrants - Summary of Warrant Activity (Details) - Warrants [Member]
3 Months Ended
Mar. 31, 2020
$ / shares
shares
Warrants, Vested, Beginning balance | shares 4,824,573
Warrants, Granted | shares 35,750
Warrants, Exercised | shares
Warrants, Cancelled | shares
Warrants, Vested, Ending balance | shares 4,860,323
Weighted average exercise price, Vested, Beginning balance | $ / shares $ 5.15
Weighted average exercise price, Granted | $ / shares 1.40
Weighted average exercise price, Exercised | $ / shares
Weighted average exercise price, Cancelled | $ / shares
Weighted average exercise price, Vested, Ending balance | $ / shares $ 5.12