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Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of Stock Option Activity
The following table summarizes the stock option activity under the 2013 Plan and 2021 Plan (in thousands except for per share amounts and years):
 Number of
shares
Weighted-
average
exercise
price per
share
Weighted-
average
remaining
contractual
life (years)
Aggregate
intrinsic
value
Options outstanding as of December 31, 2020
3,305 $3.86 7.2122,952 
Granted537 18.70 
Exercised(641)2.50 
Forfeited and cancelled(232)7.04 
Options outstanding as of September 30, 2021
2,969 $6.59 6.94122,763 
Options vested and exercisable at September 30, 2021
1,886 $3.08 5.9784,618 
Schedule of Black-Scholes Assumptions
The Black-Scholes assumptions used to value the employee options during the nine months ended September 30, 2021 are as follows:
Stock options:
Risk-free interest rate
0.8%
Weighted-average expected term of the options6.25 years
Expected dividend rate—  %
Expected volatility
53.8%
Fair value of common stock
$18.70