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12. SHARE-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2021
Share-based Payment Arrangement [Abstract] |
Schedule of Valuation Assumptions for Stock Options | The following table summarizes the weighted-average valuation assumptions and weighted-average grant date fair value of options granted during the periods shown below: Schedule of Valuation Assumptions for Stock Options
|  |  | Year Ended December 31,
|  |  | 2021 |  |  | 2020 |  |  | 2019
Assumptions (weighted-average) |  |  |  |  |  |  |  |  |
Volatility |  |  | 120% |  |  | 111% |  |  | 78%
Expected term (in years) |  |  | 4.0 |  |  | 4.0 |  |  | 4.0
Risk-free rate |  |  | 0.9% |  |  | 0.3% |  |  | 1.9%
Expected dividends |  |  | 0.0% |  |  | 0.0% |  |  | 0.0%
Pre-vest forfeiture rate |  |  | 8.5% |  |  | 8.5% |  |  | 8.5%
Grant date fair value of options granted |  | $ | 11.72 |  | $ | 1.20 |  | $ | 0.37
Schedule of Valuation Assumptions for Stock Options | The following table summarizes activity and positions with respect to options for the periods shown below (in thousands): Schedule of Valuation Assumptions for Stock Options
|  |  |  |  |  | Weighted- |  |  | Weighted-average |  |  |
|  |  |  |  |  | average |  |  | remaining |  |  | Aggregate
|  |  |  |  |  | exercise |  |  | contractual |  |  | intrinsic
Options |  |  | Shares |  |  | price |  |  | term (in years) |  |  | value
Outstanding as of December 31, 2018 |  |  | 4,646 |  | $ | 2.27 |  |  | 7.0 |  | $ | -
Granted |  |  | 1,636 |  |  | 0.65 |  |  | - |  |  | -
Exercised |  |  | - |  |  | - |  |  | - |  |  | -
Forfeited or expired |  |  | (1,178) |  |  | 2.66 |  |  | - |  |  | -
Outstanding as of December 31, 2019 |  |  | 5,104 |  |  | 1.66 |  |  | 7.4 |  |  | 122
Granted |  |  | 68 |  |  | 1.60 |  |  | - |  |  | -
Exercised |  |  | (693) |  |  | 1.44 |  |  | - |  |  | -
Forfeited or expired |  |  | (1,198) |  |  | 2.20 |  |  | - |  |  | -
Outstanding as of December 31, 2020 |  |  | 3,281 |  |  | 1.51 |  |  | 6.6 |  |  | 12,784
Granted |  |  | 8 |  |  | 14.04 |  |  | - |  |  | -
Exercised |  |  | (1,519) |  |  | 1.75 |  |  | - |  |  | -
Forfeited or expired |  |  | (237) |  |  | 1.23 |  |  | - |  |  | -
Outstanding as of December 31, 2021 |  |  | 1,533 |  | $ | 1.37 |  |  | 5.6 |  | $ | 5,645
Vested and expected to vest as of December 31, 2021 |  |  | 1,518 |  | $ | 1.55 |  |  | 5.6 |  | $ | 5,584
Exercisable as of December 31, 2021 |  |  | 1,226 |  | $ | 1.55 |  |  | 5.1 |  | $ | 4,306
Restricted Stock Unit Activity | The following table summarizes activity and positions with respect to RSUs and PSUs for the three years ended December 31, 2021: Restricted Stock Unit Activity
|  |  |  |  |  | Weighted-average
|  |  | Shares |  |  | price
Unvested as of December 31, 2018 |  |  | 1,149 |  | $ | 0.64
Granted |  |  | 1,044 |  |  | 0.60
Vested |  |  | (978) |  |  | 0.89
Forfeited |  |  | - |  |  | -
Unvested as of December 31, 2019 |  |  | 1,215 |  |  | 0.40
Granted |  |  | 1,462 |  |  | 1.08
Vested |  |  | (219) |  |  | 0.88
Forfeited |  |  | (475) |  |  | 0.77
Unvested as of December 31, 2020 |  |  | 1,983 |  |  | 0.76
Granted |  |  | 4,179 |  |  | 12.92
Vested |  |  | (2,380) |  |  | 3.11
Forfeited |  |  | (1,157) |  |  | 11.97
Unvested as of December 31, 2021 |  |  | 2,625 |  | $ | 13.05

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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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