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Stock Based Compensation (Tables)
12 Months Ended
Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]  
Schedule of weighted-average assumptions
The assumptions used in the Company’s valuation are summarized as follows, presented on a weighted average basis:
Year Ended December 31, 2023Year Ended December 31, 2022
Risk-free interest rate4.59 %3.11 %
Expected term (in years)4.85.9
Expected volatility98.1 %91.2 %
Expected annual dividends per share— %— %
Schedule of stock option activity
The following table summarizes the Company’s time-based stock option activity for the year ended December 31, 2023:     
Number of share optionsWeighted average exercise priceWeighted average remaining contractual termAggregate intrinsic value
Outstanding as of December 31, 202212,712,359$4.838.4 years$8,702 
     Granted44,135,170$1.72
     Forfeited(2,433,943)$5.56
     Exercised(204,297)$2.20
Outstanding as of December 31, 202354,209,289$2.289.3 years$42,574 
Outstanding as of December 31, 2023 - vested and expected to vest49,407,492$2.319.3 years$38,406 
Exercisable at December 31, 20235,716,319$4.897.2 years$892 
The following table summarizes the Company’s performance and market-based stock option activity for the year ended December 31, 2023:

Number of share optionsWeighted average exercise priceWeighted average remaining contractual termAggregate intrinsic value
Outstanding as of December 31, 20226,764,000$1.159.6 years$20,955 
     Granted40,835,220$1.69
     Forfeited(945,000)$1.20
     Exercised$
Outstanding as of December 31, 202346,654,220$1.629.6 years$46,237 
Outstanding as of December 31, 2023 - vested and expected to vest8,397,760$1.629.6 years$8,323 
Exercisable at December 31, 2023$$— 
Schedule of stock-based compensation expense
Stock‑based compensation expense related to stock options is recorded within the consolidated statements of operations and comprehensive loss as follows:
Year Ended December 31, 2023Year Ended December 31, 2022
Research and development
$4,408 $4,303 
General and administrative
9,700 $7,645 
Total stock-based compensation
$14,108$11,948

The following table summarizes share-based compensation expense associated with each of our share-based compensation arrangements:

Year Ended December 31, 2023Year Ended December 31, 2022
Time-based stock options
$12,606 $11,630 
Performance and market-based stock options
1,318 84 
Employee stock purchase plan
184234
Total stock-based compensation
$14,108$11,948