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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2022
Share-Based Payment Arrangement [Abstract] |
Schedule of common shares reserved for future issuance |
Schedule of common shares reserved for future issuance |  |  |  |
(In thousands) |  | Common Shares Reserved for Future Issuance |
2021 Plan |  |  | 2,403 |
2015 Plan |  |  | 530 |
2005 Plan |  |  | 162 |
Total |  |  | 3,095 |
Schedule of unvested RSAs |
Schedule of unvested RSAs |  |  |  |  |  |
|  |  | Unvested Restricted Stock Awards |
|  |  | Number of Shares (in thousands) |  |  |  | Weighted-Average Grant-Date Fair Value |
Unvested as of December 31, 2021 |  |  | 149 |  |  | $ | 5.54 |
Granted |  |  | 132 |  |  |  | 2.66 |
Vested |  |  | (97 | ) |  |  | 6.41 |
Forfeited/canceled |  |  | (26 | ) |  |  | 3.85 |
Unvested as of December 31, 2022 |  |  | 158 |  |  | $ | 2.88 |
Schedule of option activities |
Schedule of option activities |  |  |  |  |  |  |  |  |  |  |  |
|  | 2022 |  |  | 2021 |
|  | Number of Options (in thousands) |  |  | Weighted Average Exercise Price |  |  | Number of Options (in thousands) |  |  | Weighted Average Exercise Price |
Outstanding at beginning of year |  |  | 617 |  |  | $ | 6.47 |  |  |  | 1,035 |  |  | $ | 2.87 |
Granted |  |  | 334 |  |  |  | 3.63 |  |  |  | 606 |  |  |  | 12.99 |
Exercised |  |  | (99 | ) |  |  | 0.67 |  |  |  | (257 | ) |  |  | 0.97 |
Forfeited |  |  | (156 | ) |  |  | 8.16 |  |  |  | (634 | ) |  |  | 9.81 |
Expired |  |  | (28 | ) |  |  | 13.47 |  |  |  | (133 | ) |  |  | 2.82 |
Outstanding at end of year |  |  | 668 |  |  | $ | 5.22 |  |  |  | 617 |  |  | $ | 6.47 |
Options exercisable at end of year |  |  | 281 |  |  | $ | 4.13 |  |  |  | 317 |  |  | $ | 1.56 |
Schedule of stock options by exercise price |
Schedule of stock options by exercise price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  |  | Options Outstanding |  |  |  | Options Exercisable |
Range of Exercise Prices |  |  | Outstanding at 12/31/21 (in thousands) |  |  |  | Weighted Average Remaining Contractual Life (years) |  |  |  | Weighted Average Exercise Price |  |  |  | Exercisable at 12/31/21 (in thousands) |  |  |  | Weighted Average Exercise Price |
$0.40 - $0.48 |  |  | 88 |  |  |  | 0.81 |  |  | $ | .47 |  |  |  | 88 |  |  | $ | .47 |
$1.15 - $2.80 |  |  | 98 |  |  |  | 1.57 |  |  | $ | 1.78 |  |  |  | 98 |  |  | $ | 1.78 |
$3.45 - $4.75 |  |  | 331 |  |  |  | 9.17 |  |  | $ | 3.72 |  |  |  | 35 |  |  | $ | 4.38 |
$8.72 - $12.71 |  |  | 135 |  |  |  | 8.27 |  |  | $ | 12.21 |  |  |  | 53 |  |  | $ | 11.87 |
$23.52 - $23.52 |  |  | 17 |  |  |  | 8.17 |  |  | $ | 23.52 |  |  |  | 7 |  |  | $ | 23.52 |
$0.40 - $23.52 (all) |  |  | 668 |  |  |  | 6.73 |  |  | $ | 5.22 |  |  |  | 281 |  |  | $ | 4.13 |
Other information regarding stock options |
Other information regarding stock options |  |  |  |  |  |
|  | Outstanding Stock Options (Expected to Vest) |  |  | Options that are Exercisable |
As of December 31, 2022 |  |  |  |  |  |  |  |
Number of outstanding options (in thousands) |  |  | 688 |  |  |  | 281 |
Weighted average remaining contractual life |  |  | 6.73 years |  |  |  | 3.39 years |
Weighted average exercise price per share |  | $ | 5.22 |  |  | $ | 4.13 |
Intrinsic value (in thousands) |  | $ | 372 |  |  | $ | 372 |
Valuation assumptions for stock-based compensation |
Valuation assumptions for stock-based compensation |  |  |  |  |  |
|  | 2022 |  |  | 2021 |
Weighted average grant date fair value |  | $ | 3.32 |  |  | $ | 8.09 |
Weighted average assumptions used: |  |  |  |  |  |  |  |
Expected dividend yield |  |  | 0.00% |  |  |  | 0.00% |
Risk-free interest rate |  |  | 2.17% |  |  |  | 0.70% |
Expected volatility |  |  | 129.54% |  |  |  | 66.72% |
Expected life (in years) |  |  | 6.76 |  |  |  | 4.29 |

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