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Equity Incentive Plan - Stock-Based Compensation Expense and Common Stock Warrants (Tables) | 3 Months Ended
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Mar. 31, 2023
Share-Based Payment Arrangement [Abstract] |
Summary of Stock Option Award Activity | A summary of the stock option activity for the three months ended March 31, 2023 is as follows: Summary of Stock Option Award Activity
|  | Number of Stock Options |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Life |  |  | Aggregate Intrinsic Value |
Outstanding as of December 31, 2022 |  |  | 1,399,252 |  |  | $ | 2.40 |  |  |  | 7.79 |  |  | $ | 928 |
Granted |  |  | 304,325 |  |  | $ | 3.40 |  |  |  | - |  |  | $ | - |
Exercised |  |  | (3,547 | ) |  | $ | 1.52 |  |  |  | - |  |  | $ | - |
Forfeited |  |  | (25,000 | ) |  | $ | 1.82 |  |  |  | - |  |  | $ | - |
Expired |  |  | - |  |  | $ | - |  |  |  | - |  |  | $ | - |
Outstanding as of March 31, 2023 |  |  | 1,675,030 |  |  | $ | 2.59 |  |  |  | 7.95 |  |  | $ | 2,131 |
Exercisable as of March 31, 2023 |  |  | 743,247 |  |  | $ | 1.92 |  |  |  | 6.04 |  |  | $ | 1,478 |
Vested and expected to vest as of March 31, 2023 |  |  | 1,675,030 |  |  | $ | 2.59 |  |  |  | 7.95 |  |  | $ | 2,131 |
Schedule of Estimate Fair Value of Stock Options | For the three months ended March 31, 2023, and 2022, the Company utilized the Black-Scholes option-pricing model for estimating the fair value of the stock option granted. The Company estimated the fair value of each option grant on the grant date using the Black-Scholes option pricing model with the following weighted-average assumptions: Schedule of Estimate Fair Value of Stock Options
|  | Three Months Ended March 31, |
|  | 2023 |  |  | 2022 |
Expected Volatility |  |  | 99.49% – 103.76 | % |  |  | 41.66% – 42.13 | %
Expected term (years) |  |  | 6.02 – 10.0 |  |  |  | 6.44 |
Risk-free interest rate |  |  | 3.51% – 4.28 | % |  |  | 0.62% – 1.00 | %
Dividend rate |  |  | – | % |  |  | – | %
Schedule of Stock Based Compensation Expense | The following table summarizes the components of stock-based compensation expense recognized in the Company’s Condensed Statements of Operations and Comprehensive Loss during the three months ended March 31, 2023, and 2022 (in thousands): Schedule of Stock Based Compensation Expense
|  | 2023 |  |  | 2022 |
|  | Three Months Ended |
|  | March 31, |
|  | 2023 |  |  | 2022 |
Research and development |  | $ | 42 |  |  | $ | 45 |
General and administrative |  |  | 202 |  |  |  | 123 |
Total stock-based compensation expense |  | $ | 244 |  |  | $ | 168 |
Schedule of Warrant Activity | The following is a summary of the common stock warrant activity during the three months ended March 31, 2023. Schedule of Warrant Activity
|  | Shares Issuable Upon Exercise of Outstanding Warrants |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Life |  |  | Aggregate Intrinsic Value (In thousands) |
Outstanding as of December 31, 2022 |  |  | 2,786,995 |  |  | $ | 10.80 |  |  |  | 3.67 |  |  | $ | 30,100 |
Issued |  |  | - |  |  | $ | - |  |  |  | - |  |  | $ | - |
Exercised |  |  | - |  |  | $ | - |  |  |  | - |  |  | $ | - |
Expired |  |  | - |  |  | $ | - |  |  |  | - |  |  | $ | - |
Outstanding as of March 31, 2023 |  |  | 2,786,995 |  |  | $ | 10.80 |  |  |  | 3.42 |  |  | $ | 30,100 |

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- Definition Tabular disclosure of share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + 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 -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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- Definition Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-1 + Details
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