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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2023
Stock-Based Compensation [Abstract] |
Weighted-Average Assumptions Used for Stock Options Granted | The following weighted-average assumptions were used for stock options granted during the years ended December 31, 2023 and 2022:
|  | Year ended December 31, |
|  | 2023 |  |  | 2022 |
Weighted average risk-free rate |  |  | 3.82 | % |  |  | 2.52 | %
Weighted average volatility |  |  | 95.15 | % |  |  | 90.49 | %
Dividend yield |  |  | 0 | % |  |  | 0 | %
Expected term |  | 5.44 years |  |  | 5.79 years |
Summarizes of Stock Option Activity | The following table summarizes stock option activity for the years ended December 31, 2023 and 2022 (in thousands except for per-share and remaining contractual life data):
|  | Outstanding Options |  |  | Weighted Average Exercise Price per Share |  |  | Weighted Average Remaining Contractual Life (in years) |  |  | Aggregate Intrinsic Value |
Outstanding January 1, 2022 |  |  | 199 |  |  | $ | 168 |  |  |  | 9.38 |  |  | $ | - |
Granted |  |  | 287 |  |  |  | 17 |  |  |  |  |  |  |  |  |
Cancelled |  |  | (127 | ) |  |  | 141 |  |  |  |  |  |  |  |  |
Outstanding December 31, 2022 |  |  | 359 |  |  |  | 57 |  |  |  | 7.57 |  |  |  | - |
Granted |  |  | 237 |  |  |  | 4 |  |  |  |  |  |  |  |  |
Cancelled |  |  | (207 | ) |  |  | 19 |  |  |  |  |  |  |  |  |
Outstanding December 31, 2023 |  |  | 389 |  |  | $ | 45 |  |  |  | 7.04 |  |  | $ | - |
Options vested and exercisable at December 31, 2023 |  |  | 331 |  |  | $ | 50 |  |  |  | 6.69 |  |  | $ | - |
Summarizes of RSU Activity | The following table summarizes RSU activity for the years ended December 31, 2023 and 2022 (in thousands except for per-share data):
|  | Outstanding Restricted Stock Units |  |  | Weighted Average Fair Value per Share |
January 1, 2022 |  |  | 12 |  |  | $ | 276 |
Granted |  |  | 55 |  |  |  | 39 |
Released |  |  | (3 | ) |  |  | 271 |
Cancelled |  |  | (60 | ) |  |  | 61 |
December 31, 2022 |  |  | 4 |  |  |  | 236 |
Cancelled |  |  | (3 | ) |  |  | 199 |
December 31, 2023 |  |  | 1 |  |  | $ | 322 |
Balance expected to vest at December 31, 2023 |  |  | 1 |  |  | $ | 322 |
Stock-Based Compensation Expense | For the years ended December 31, 2023 and 2022, the Company recognized stock-based compensation expense as follows (in thousands):
|  | Years ended December 31, |
|  | 2023 |  |  | 2022 |
Research and development |  | $ | 234 |  |  | $ | 1,249 |
General and administrative |  |  | 1,008 |  |  |  | 1,686 |
Total |  | $ | 1,242 |  |  | $ | 2,935 |

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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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