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Stock Based Compensation (Tables)
6 Months Ended
Jun. 30, 2024
Share-Based Payment Arrangement [Abstract]  
Schedule of Total Stock-Based Compensation
The Company recorded total stock-based compensation for its outstanding stock options and warrants in its Statements of Operations as follows (in thousands):
Three Months Ended
June 30,
Six Months Ended June 30,
2024202320242023
Research and development$217 $230 $783 $465 
General and administrative374 82 963 159 
Total stock-based compensation expense$591 $312 $1,746 $624 
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions
The following table summarizes the range of assumptions used to estimate the fair value of stock options issued using the Black-Scholes-Merton option pricing model:
Six Months Ended June 30,
20242023
Stock price
$3.76 to $5.19
n/a
Exercise price
$3.76 to $5.19
n/a
Expected volatility
97.06% to 101.55%
n/a
Risk free interest rates
4.12% to 4.46%
n/a
Expected term (years)
5 to 7
n/a
Share-Based Payment Arrangement, Option, Activity
The following table summarizes the activity for stock options for the six months ended June 30, 2024:
OptionsWeighted-
Average
Exercise Price
Weighted Average
Remaining
Contractual Term
(in years)
Aggregate
Intrinsic
Value (in
thousands)
Outstanding at December 31, 20231,239,750 $8.00 6.4$1,865 
Issued798,379 $5.06 
Exercised(1,000)$4.00 
Forfeited and cancelled— $— 
Outstanding at June 30, 20242,037,129 $6.85 7.4$538 
Exercisable at June 30, 20241,049,025 $7.58 5.7$302 
Schedule Of Share-Based Payment Award, Warrants, Valuation Assumptions
The following table summarizes the range of assumptions used to estimate the fair value of warrants issued using the Black-Scholes-Merton option pricing model:
Six Months Ended June 30,
20242023
Stock price
$4.50 to $5.19
$4.50 to $5.00
Exercise price
$4.50 to $5.19
$6.00 to $6.25
Expected volatility
97.06% to 100.64%
101.46% to 103.85%
Risk free interest rates
4.12% to 4.39%
3.59% to 3.97%
Expected term (years)
 5 to 6.25
3 to 5
Schedule of Warrants, Activity
The following table summarizes the activity for warrants for the six months ended June 30, 2024:
WarrantsWeighted-
Average
Exercise Price
Weighted Average
Remaining Contractual Term
(in years)
Aggregate
Intrinsic
Value (in
thousands)
Outstanding at December 31, 2023801,950 $6.30 3.9$2,096 
Issued50,000 $4.85 
Exercised(2,500)$3.00 
Forfeited and cancelled(20,000)$3.00 
Outstanding at June 30, 2024829,450 $6.31 4.0$186 
Exercisable at June 30, 2024730,700 $6.35 3.6$176