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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 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 | %

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- Definition Tabular disclosure of assumption used to determine benefit obligation and net periodic benefit cost of defined benefit plan. Includes, but is not limited to, discount rate, rate of compensation increase, expected long-term rate of return on plan assets and interest crediting rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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