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Equity-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2024
Share-Based Payment Arrangement [Abstract] |
Schedule of Equity-Based Compensation Expense Classification in Statement of Operations | Equity-based compensation expense is classified in the statements of operations as follows:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2024 |  | 2023 |  | 2024 |  | 2023
Research and development expense | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 154 |
General and administrative expense | 6 |  |  | 969 |  |  | 11 |  |  | 1,123 |
| $ | 6 |  |  | $ | 969 |  |  | $ | 11 |  |  | $ | 1,277 |
Schedule of Assumptions Used to Determine Fair Value of Common Stock Option Grants | The following table presents the assumptions used in the Black-Scholes option-pricing model for stock options granted during the six months ended June 30, 2023:
|  |  | Six Months Ended June 30,
|  |  | 2023
Expected term |  |  | 5.8 to 5.8 years
Risk-free interest rate |  |  | 3.83% to 3.83%; weighted avg. 3.83%
Expected volatility |  |  | 101.0% to 101.0%; weighted avg. 101.0%
Forfeiture rate |  |  | 5 | %
Expected dividend yield |  |  | — | %
The fair value of the underlying common stock and the exercise price for the common stock options granted during the six months ended June 30, 2023 are summarized in the table below. No options were granted during the six months ended June 30, 2024.
| Fair Value of Underlying Common Stock |  | Exercise Price of Common Stock Option
Six months ended June 30, 2023 | $1.58; weighted avg. $1.58 |  | $1.58; weighted avg. $1.58
Schedule of Common Stock Option Activity | A summary of common stock option activity as of the periods indicated is as follows:
| Options |  | Weighted-Average Exercise Price |  | Weighted-Average Remaining Contractual Term (years) |  | Aggregate Intrinsic Value (thousands)
Outstanding - December 31, 2023 | 12,115 |  |  | $ | 4.28 |  |  | 5.4 |  | $ | — |
Granted | — |  |  | — |  |  |  |  |
Exercised | — |  |  | — |  |  |  |  |
Forfeited | (416) |  |  | 5.51 |  |  |  |  |
Outstanding - June 30, 2024 | 11,699 |  |  | $ | 5.51 |  |  | 4.9 |  | $ | — |
Exercisable - June 30, 2024 | 11,699 |  |  | $ | 5.51 |  |  | 4.9 |  | $ | — |
Vested and Expected to Vest - June 30, 2024 | 11,699 |  |  | $ | 5.51 |  |  | 4.9 |  | $ | — |
Schedule of Restricted Stock Unit Awards Activity | A summary of restricted stock unit activity of the periods indicated is as follows:
| Restricted Stock Units |  | Weighted-Average Grant Date Fair Value
Unvested balance - December 31, 2023 | 3,043 |  |  | $ | 10.41 |
Granted | — |  |  | — |
Vested | (592) |  |  | 18.47 |
Forfeited | (417) |  |  | 3.45 |
Unvested balance - June 30, 2024 | 2,034 |  |  | $ | 12.24 |

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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -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 -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -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 Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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