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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2021
Share-based Payment Arrangement [Abstract]  
Share-based Payment Arrangement, Option, Activity
The following is a summary of stock option activity during the nine months ended September 30, 2021:
Number of
options
outstanding		Weighted
average
exercise
price (*)		Average
remaining
contractual life
(in years)		Aggregate
intrinsic value
(in thousands)
(**)
Outstanding – December 31, 2020
466,742 $0.14 8.2$81 
Options granted
358,177 2.30 
Forfeitures
(4,545)0.07 
Options exercised
(27,461)— 
Outstanding – September 30, 2021
792,913 1.11 8.53,881 
Exercisable – September 30, 2021
289,720 $0.33 7.2$1,642 
(*) $ - Indicates exercise price less than $0.01 per share
(**) Intrinsic value is based on the fair market value of the Company's common stock.
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions For the nine months ended September 30, 2021 and 2020, the assumptions used in the Black-Scholes option pricing model, which was used to estimate the grant date fair value per option, were as follows:
Nine Months ended September 30,
20212020
Weighted-average Black-Scholes option pricing model assumptions:
Volatility
90.01% - 93.02%
74.61% - 74.89%
Expected term (in years)
5.69 - 5.98
5.55 - 5.87
Risk-free rate
0.69% - 0.82%
0.25% - 0.39%
Expected dividend yield$— $— 
Weighted average grant date fair value per share
$2.07 - 3.00
$0.16 - 0.18
Share-based Payment Arrangement, Expensed and Capitalized, Amount
The following is a summary of stock-based compensation expense:
Three Months ended September 30,Nine Months ended September 30,
2021202020212020
Selling, general and administration$48,594 $1,605 $75,049 $4,023 
Research and development3,916 — 10,160 — 
$52,510 $1,605 $85,209 $4,023