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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2019
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 | %

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