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Common Stock Purchase Warrants - Summary of Warrant Activity (Details) - Warrants [Member]
6 Months Ended
Jun. 30, 2019
$ / shares
shares
Warrants, Vested, Beginning balance | shares 4,693,145
Warrants, Granted | shares
Warrants, Exercised | shares (529,000)
Warrants, Cancelled | shares
Warrants, Vested, Ending balance | shares 4,164,145
Weighted average exercise price, Vested, Beginning balance | $ / shares $ 5.40
Weighted average exercise price, Granted | $ / shares
Weighted average exercise price, Exercised | $ / shares (2.96)
Weighted average exercise price, Cancelled | $ / shares
Weighted average exercise price, Vested, Ending balance | $ / shares $ 5.71