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Equity (Tables) | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
Summary of Option Activities |
The following is a summary of option activities for the years ended December 31, 2016 and 2017:
|  | Number of Shares |  | Weighted Average Grant Date Fair Value |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value
Outstanding, December 31, 2015 |  | 200,000 |  |  | $ | 0.14 |  |  | $ | 0.20 |  |  |  |  |  |
Granted - 2016 |  | 460,000 |  |  | 3.75 |  |  | 5.83 |  |  |  |  |  |
Cancelled - 2016 |  | (150,000 | ) |  | 0.14 |  |  | 0.20 |  |  |  |  |  |
Outstanding, December 31, 2016 |  | 510,000 |  |  | $ | 3.40 |  |  | $ | 5.28 |  |  | 9.29 |  | $ | 275,500 |
Granted - 2017 |  | 835,000 |  |  | $ | 1.59 |  |  | $ | 2.42 |  |  |  |  |
Cancelled - 2017 |  | — |  |  |  |  |  |  |  |  |
Outstanding, December 31, 2017 |  | 1,345,000 |  |  | $ | 1.93 |  |  | $ | 3.50 |  |  | 9.07 |  | $ | 83,000 |
Exercisable, December 31, 2017 |  | 50,000 |  |  | $ | 0.13 |  |  | $ | 0.20 |  |  | 2.42 |  | $ | 83,000 |
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 |  | —% |  | —%
Components of Share-Based Compensation | Stock-based compensation expense for the years ended December 31, 2017 and 2016, are as follows (in thousands):
|  | Year Ended December 31,
|  | 2017 |  | 2016
General and administrative |  | $ | 684 |  |  | $ | 321 |
Research and development |  | 23 |  |  | 3 |
Total |  | $ | 707 |  |  | $ | 324 |

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