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Equity-Based Compensation (Tables)
6 Months Ended
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,
2024202320242023
Research and development expense$— $— $— $154 
General and administrative expense969 11 1,123 
$$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%
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 StockExercise 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:
OptionsWeighted-Average Exercise PriceWeighted-Average Remaining Contractual Term (years)Aggregate Intrinsic Value (thousands)
Outstanding - December 31, 202312,115 $4.28 5.4$— 
Granted— — 
Exercised— — 
Forfeited(416)5.51 
Outstanding - June 30, 202411,699 $5.51 4.9$— 
Exercisable - June 30, 202411,699 $5.51 4.9$— 
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 UnitsWeighted-Average Grant Date Fair Value
Unvested balance - December 31, 20233,043 $10.41 
Granted— — 
Vested(592)18.47 
Forfeited(417)3.45 
Unvested balance - June 30, 20242,034 $12.24