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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2023
Stockholders' Equity Note [Abstract] |
Schedule of Stock Options Activity | A summary of the stock option activity under the Company's equity incentive plans is presented below:
| Number of Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Term |  | Aggregate Intrinsic Value
Balance as of December 31, 2022 | 3,976 |  | $ | 6.20 |  |  | 3.80 |  | $ | — |
Granted | 57 |  | 0.61 |  |  |  |  |
Exercised | (34) |  | 0.86 |  |  |  |  |
Forfeited | (182) |  | 5.25 |  |  |  |  |
Expired | (440) |  | 5.90 |  |  |  |  |
Balance as of December 31, 2023 | 3,377 |  | $ | 6.24 |  |  | 2.36 |  | $ | — |
Expected to vest at December 31, 2023 | 3,377 |  | $ | 6.24 |  |  | 2.36 |  | $ | — |
Exercisable at December 31, 2023 | 3,045 |  | $ | 6.44 |  |  | 1.71 |  | $ | — |
Schedule of Fair Value of Stock Option Awards Valuation Assumptions | The fair value of stock option awards is estimated on the date of grant using the Black-Scholes option-pricing model based upon the following range of assumptions:
| 2023 |  | 2022 |  | 2021
Exercise price | $0.61 – $0.62 |  | $1.17 –$5.31 |  | $8.99 – $9.25
Expected dividend yield | 0% |  | 0% |  | 0%
Expected volatility | 93% –97% |  | 48% – 93% |  | 45% –48%
Expected term (years) | 6.10– 6.20 |  | 1.00 – 6.20 |  | 5.00 – 6.07
Risk free interest rate | 4.17% – 4.57% |  | 1.86% – 3.95% |  | 0.80% – 1.04%
Schedule of RSU Activity | A summary of RSU activity is presented below:
| Shares |  | Weighted Average Grant-Date Fair Value
Outstanding as of December 31, 2022 | 7,495 |  | $ | 3.59 |
Granted | 12,360 |  | 0.56 |
Vested | (4,531) |  | 3.10 |
Forfeited | (6,565) |  | 1.76 |
Outstanding as of December 31, 2023 | 8,759 |  | $ | 0.94 |

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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 -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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