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Warrant Liability (Tables) | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
Schedule of Assumptions Used | The assumptions used in the BSM and MCM models for the Warrants are as follows:
|  | Year Ended December 31,
|  | 2017 |  | 2016
Risk-free interest rate |  | 1.68%-1.86% |  | —%
Volatility |  | 80.00%-160.11% |  | —%
Expected life (years) |  | 0.5-5.0 |  | —
Dividend yield |  | -% |  | —%
The fair value of the option grants has been estimated, with the following weighted-average assumptions:
|  | Year Ended December 31,
|  | 2017 |  | 2016
Risk-free interest rate |  | 1.83 | % | to | 1.95% |  | 1.3%
Volatility |  | 80% |  | 70.18 | % | to | 70.44%
Expected life (years) |  | 5.0 |  | to | 6.25 |  | 6 |  | to | 6.25
Expected dividend yield |  | —% |  | —%
Schedule of Warrant Activity | A summary of our Warrant activity and related information follows:
Description |  | Number of Shares Under Warrant |  | Range of Warrant Price per Share |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life (Years)
Balance at January 1, 2017 |  | — |  |  | — |  |  | — |  |  | — |
Granted |  | 8,235,923 |  |  | $1.35-$1.50 |  |  | $ | 1.43 |  |  | — |
Exercised |  | (2,728,434 | ) |  | — |  |  | $ | 1.46 |  |  | — |
Expired |  | (5,087,717 | ) |  | — |  |  | $ | 1.40 |  |  | — |
Balance at December 31, 2017 |  | 419,772 |  |  | — |  |  | $ | 1.46 |  |  | 4.38 |
Vested and Exercisable at December 31, 2017 |  | 419,772 |  |  | $1.35-$1.50 |  |  | $ | 1.46 |  |  | 4.38 |

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- Definition Tabular disclosure for warrant activity. + References No definition available. + Details
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- Definition Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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