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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2022
Share-Based Payment Arrangement [Abstract]  
Share-Based Payment Arrangement, Option, Activity
The following table summarizes the Company’s stock option activity since December 31, 2021:
Number of SharesWeighted-Average Exercise Price
Balance at December 31, 20213,002,803 $3.96 
Granted1,160,074 8.40 
Exercised(55,687)3.67 
Forfeited(135,633)4.66 
Balance at September 30, 20223,971,557 $5.24 
Options vested and exercisable at September 30, 2022536,064 $3.71 
Options vested and expected to vest at September 30, 20223,971,557 $5.24 
Share-Based Payment Arrangement, Outstanding Award, Activity, Excluding Option
The following table summarizes the Company’s time-based restricted common stock activity since December 31, 2021:
Number of SharesWeighted-Average Grant-Date Fair Value
Unvested restricted common stock at December 31, 202110,801,361 $0.10 
Issued— — 
Vested(4,385,478)0.09 
Repurchased(11,160)0.35 
Unvested restricted common stock at September 30, 20226,404,723 $0.04 
The following table summarizes the Company’s performance-based restricted common stock activity since December 31, 2021:
Number of SharesWeighted-Average Grant-Date Fair Value
Unvested restricted common stock at December 31, 20214,553,223 $0.10 
Issued— — 
Vested(360,226)0.19 
Repurchased— — 
Unvested restricted common stock at September 30, 20224,192,997 $0.10 
Share-Based Payment Arrangement, Expensed and Capitalized, Amount
The following table below summarizes the classification of the Company’s stock-based compensation expense related to stock options and restricted common stock awards in the consolidated statements of operations and comprehensive loss (in thousands):
Three Months Ended
September 30,		Nine Months Ended
September 30,
2022202120222021
General and administrative$467 $130 $1,288 $172 
Research and development950 209 $2,597 $467 
$1,417 $339 $3,885 $639