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STOCK-BASED COMPENSATION (Tables)
12 Months Ended
Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]  
Schedule of Share-based Payment Arrangement, Option, Activity
The following is a summary of stock option activity during the years ended December 31, 2023 and 2022:
Number of
options
outstanding
Weighted
average
exercise
price
Average
remaining
contractual life
(in years)
Aggregate
intrinsic value
(in thousands)
(*)
Outstanding – December 31, 20211,105,938 $2.03 8.8$1,535 
Options granted1,251,000 1.70 
Forfeitures
(121,334)2.98 
Options exercised(38,806)— 
Outstanding – December 31, 20222,196,798 $1.76 8.7$6,770 
Options granted4,363,800 2.42 
Forfeitures(288,001)2.48 
Options exercised(180,072)1.19 
Outstanding – December 31, 20236,092,525 2.22 8.7$2,945 
Exercisable – December 31, 20231,212,312 $1.78 7.4$1,203 

(*) Intrinsic value is based on the fair market value of the Company's common stock.
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions For the years ended December 31, 2023 and 2022, the assumptions used in the Black-Scholes option pricing model, which was used to estimate the grant date fair value per option, were as follows:
Year ended December 31,
20232022
Weighted-average Black-Scholes option pricing model assumptions:
Volatility
110.23% - 117.62%
107.25% - 111.06%
Expected term (in years)
5.85 - 6.07
5.62 - 5.94
Risk-free rate
3.54% - 4.77%
1.47% - 3.17%
Expected dividend yield$— $— 
Weighted average grant date fair value per share
$1.75 - 3.38
$1.08 - 3.34
Schedule of Nonvested Restricted Stock Units Activity
The following is a summary of RSUs award activity:
Year ended December 31,
20232022
Number of SharesWeighted Average Grant Date Fair ValueNumber of SharesWeighted Average Grant Date Fair Value
Non-vested at beginning of the year253,970 $1.47 30,000 $3.20 
Shares granted222,881 3.11 248,970 1.36 
Shares vested(258,970)1.48 (25,000)2.46 
Non-vested at end of year217,881 $3.12 253,970 $1.47 
Schedule of Share-based Payment Arrangement, Expensed and Capitalized, Amount
The following is a summary of stock-based compensation expense:
Year ended December 31,
20232022
General and administration
Stock options $2,069,556 $657,368 
RSUs488,971 235,035 
Total general and administration2,558,527 892,403 
R&D
Stock options629,092 213,813 
RSUs20,457 13,601 
Total R&D649,549 227,414 
Total stock based compensation$3,208,076 $1,119,817