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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2024
Share-Based Payment Arrangement [Abstract]  
Schedule of Share-Based Payment Arrangement, Option, Activity
The following table summarizes the Company’s stock option activity for the six months ended June 30, 2024:
Number of SharesWeighted-Average Exercise Price
Outstanding at December 31, 20237,641,863 $9.79 
Granted4,268,210 8.16 
Exercised(19,203)3.70 
Cancelled or forfeited(268,635)11.34 
Outstanding at June 30, 202411,622,235 $9.17 
Options vested and exercisable at June 30, 20243,682,315 $8.44 
Options vested and expected to vest at June 30, 202411,622,235 $9.17 
The following table summarizes the Company’s performance-based stock option activity for the six months ended June 30, 2024:
Number of SharesWeighted-Average
Grant Date Fair
Value
Outstanding at December 31, 2023411,730 $6.65 
Granted650,000 7.74 
Exercised— — 
Cancelled or forfeited— — 
Outstanding at June 30, 20241,061,730 $7.31 
Vested and exercisable at June 30, 2024385,208 $6.72 
Schedule of Share-Based Payment Arrangement, Outstanding Award, Activity, Excluding Option
The following table summarizes the Company’s time-based restricted common stock activity for the six months ended June 30, 2024:
Number of SharesWeighted-Average Grant-Date Fair Value
Outstanding at December 31, 2023903,227 $0.17 
Issued— — 
Vested(641,470)0.14 
Repurchased(4,423)0.34 
Outstanding at June 30, 2024257,334 $0.23 
The following table summarizes the Company’s performance-based restricted common stock activity for the six months ended June 30, 2024:
Number of SharesWeighted-Average Grant-Date Fair Value
Outstanding at December 31, 20233,832,769 $0.07 
Issued— — 
Vested(360,226)0.18 
Repurchased— — 
Outstanding at June 30, 20243,472,543 $0.06 
Schedule of 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 condensed consolidated statements of operations and comprehensive loss:
Three Months Ended
June 30,		Six Months Ended
June 30,
(in thousands)2024202320242023
Stock-based compensation expense:
Research and development$4,221 $2,164 $6,946 $3,334 
General and administrative3,870 1,419 6,354 1,930 
Total stock-based compensation expense$8,091 $3,583 $13,300 $5,264