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Common Stock Purchase Warrants (Details Narrative)
6 Months Ended
Jun. 30, 2019
USD ($)
$ / shares
shares
Common Stock Purchase Warrants [Member]  
Warrants to purchase common stock | shares 4,532,145
Warrant expiration term, description July 15, 2020 through July 31, 2023
Warrants [Member]  
Intrinsic value of all outstanding warrants | $ $ 0
Warrants, weighted average remaining term 28 months
Minimum [Member] | Common Stock Purchase Warrants [Member]  
Warrant, exercise per share $ 2.60
Maximum [Member] | Common Stock Purchase Warrants [Member]  
Warrant, exercise per share $ 16.50