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10. Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 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, 2018 |  |  | 149 |  |  |  | 2,889 |  |  | $ | 1.80 |
Authorized |  |  | 855 |  |  |  | - |  |  |  | - |
Granted |  |  | (1,116 | ) |  |  | 1,116 |  |  |  | 0.78 |
Forfeited/expired |  |  | 259 |  |  |  | (259 | ) |  |  | 3.53 |
Balance as of December 31, 2019 |  |  | 147 |  |  |  | 3,746 |  |  | $ | 1.38 |
Authorized |  |  | 2,342 |  |  |  | - |  |  |  | - |
Granted |  |  | (2,320 | ) |  |  | 2,320 |  |  |  | 0.69 |
Exercised |  |  | - |  |  |  | (528 | ) |  |  | 0.96 |
Forfeited/expired |  |  | 211 |  |  |  | (211 | ) |  |  | 0.89 |
Balance as of December 31, 2020 |  |  | 380 |  |  |  | 5,327 |  |  | $ | 1.14 |
Vested and unvested awards outstanding |
|  | Number of Shares |  |  | Weighted Average Exercise Price |  |  | Remaining Contractual Term (In Years) |  |  | Aggregate Intrinsic Value1 |
2020 |  |  |  |  |  |  |  |  |  |  |  |
Vested and Exercisable |  |  | 3,718 |  |  | $ | 1.30 |  |  |  | 7.42 |  |  | $ | 4,592 |
Unvested |  |  | 1,609 |  |  |  | 0.77 |  |  |  | 8.82 |  |  |  | 2,771 |
Total |  |  | 5,327 |  |  | $ | 1.14 |  |  |  | 7.84 |  |  | $ | 7,363 |
2019 |  |  |  |  |  |  |  |  |  |  |  |
Vested and Exercisable |  |  | 2,659 |  |  | $ | 1.56 |  |  |  | 7.45 |  |  | $ | 145 |
Unvested |  |  | 1,087 |  |  |  | 0.93 |  |  |  | 8.78 |  |  |  | 77 |
Total |  |  | 3,746 |  |  | $ | 1.38 |  |  |  | 7.84 |  |  | $ | 222 |
Schedule of weighted average fair value calculations for options |
Description |  | For the years ended December 31, |
|  | 2020 |  |  | 2019 |
Dividend-yield |  |  | 0 | % |  |  | 0 | %
Risk-free interest rate |  |  | 0.94 | % |  |  | 2.38 | %
Expected volatility |  | 87.37 | % |  |  | 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 |  | $ | 0.51 |  |  | $ | 0.59 |

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- Definition Tabular disclosure of share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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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- Definition Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding and exercisable options that are fully vested and expected to vest. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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