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7. Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2020
Share-based Payment Arrangement, Noncash Expense [Abstract] |
Schedule of options granted under employee stock plans |
|  | Shares Available for Grant |  |  | Number of Shares Outstanding |  |  | Weighted-Average Exercise Price |
Balance as of December 31, 2019 |  |  | 147 |  |  |  | 3,746 |  |  | $ | 1.38 |
Authorized |  |  | 2,342 |  |  |  | - |  |  |  | - |
Granted |  |  | (2,320 | ) |  |  | 2,320 |  |  |  | 0.69 |
Exercised |  |  | - |  |  |  | (232 | ) |  |  | 1.27 |
Forfeited/expired |  |  | 83 |  |  |  | (83 | ) |  |  | 0.76 |
Balance as of September 30, 2020 |  |  | 252 |  |  |  | 5,751 |  |  | $ | 1.12 |
Schedule of weighted average fair value calculations for options |
|  | For the nine months ended September 30, |
Description |  | 2020 |  |  | 2019 |
Dividend-yield |  |  | 0 | % |  |  | 0 | %
Risk-free interest rate |  |  | 0.94 | % |  |  | 2.38 | %
Expected volatility |  |  | 88.15 | % |  |  | 88.54 | %
Expected life (years) |  |  | 6.55 |  |  |  | 6.55 |
Market value per share on grant date |  | $ | 0.69 |  |  | $ | 0.78 |
Fair value per share on grant date |  | $ | 0.52 |  |  | $ | 0.59 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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