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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2020
Equity [Abstract]  
Schedule of Estimated Values of Warrants Valuation Assumptions

The estimated values of warrants, as well as the assumptions that were used in calculating such values were based on estimates at the issuance date as follows:

 

    Placement
Agent
December 30,
2016		     Bridge
Noteholders
September 21,
2017		  
Risk-free interest rate     1.93 %     1.89 %
Weighted average expected term     5 years       5 years  
Expected volatility     123.07 %     130.80 %
Expected dividend yield     0.00 %     0.00 %

 

    Placement
Agent
November 17,
2017		     Placement
Agent
November 30,
2017		  
Risk-free interest rate     2.06 %     2.14 %
Weighted average expected term     5 years       5 years  
Expected volatility     129.87 %     129.34 %
Expected dividend yield     0.00 %     0.00 %

 

    Placement
Agent
September 20,
2018		     Placement
Agent
September 26,
2018		  
Risk-free interest rate     2.96 %     2.96 %
Weighted average expected term     5 years       5 years  
Expected volatility     122.52 %     122.92 %
Expected dividend yield     0.00 %     0.00 %

 

    Placement
Agent
March 2, 2020		  
Risk-free interest rate     0.88 %
Weighted average expected term     5 years  
Expected volatility     130.12 %
Expected dividend yield     0.00 %