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9. Outstanding Warrants (Tables) | 12 Months Ended
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Dec. 31, 2019
Stockholders' deficit: |
Weighted average assumptions |
Description |  | For the year ended December 31 |
|  | 2019 |  |  | 2018 |
Dividend-yield |  |  | 0 | % |  |  | 0 | %
Risk-free interest rate |  |  | 2.13 | % |  |  | 2.25 | %
Expected volatility |  |  | 103.0 | % |  |  | 92.2 | %
Expected life (years) |  |  | 2 |  |  |  | 2 |
Market value per share on grant date |  | $ | 0.73 |  |  | $ | 1.05 |
Exercise price per share |  | $ | 0.01 |  |  | $ | 0.01 |
Fair value per share on grant date |  | $ | 0.72 |  |  | $ | 1.04 |
Schedule of warrant activity |
|  | Warrants Outstanding & Exercisable |  |  | Weighted - Average Exercise Price |  |  | Average Remaining Term in Years |
Outstanding December 31, 2017 |  |  | 330 |  |  | $ | 3.47 |  |  |  | 3.02 |
Granted |  |  | 227 |  |  |  | 0.01 |  |  |  |  |
Exercised |  |  | (227 | ) |  |  | 0.01 |  |  |  |  |
Expired |  |  | (235 | ) |  |  | 3.82 |  |  |  |  |
Outstanding December 31, 2018 |  |  | 95 |  |  | $ | 2.59 |  |  |  | 6.95 |
Granted |  |  | 227 |  |  |  | 0.01 |  |  |  |  |
Exercised |  |  | (227 | ) |  |  | 0.01 |  |  |  |  |
Outstanding December 31, 2019 |  |  | 95 |  |  | $ | 2.59 |  |  |  | 5.95 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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