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Stock Based Compensation - Stock option activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Time-based stock options    
Number of share options    
Beginning balance (in shares) 12,712,359  
Granted (in shares) 44,135,170  
Forfeited (in shares) (2,433,943)  
Exercised (in shares) (204,297)  
Ending balance (in shares) 54,209,289 12,712,359
Weighted average exercise price    
Beginning balance (in dollars per share) $ 4.83  
Granted (in dollars per share) 1.72  
Forfeited (in dollars per share) 5.56  
Exercised (in dollars per share) 2.20  
Ending balance (in dollars per share) $ 2.28 $ 4.83
Stock option activity, additional disclosures    
Weighted average remaining contractual term, options outstanding 9 years 3 months 18 days 8 years 4 months 24 days
Aggregate intrinsic value, options outstanding $ 42,574 $ 8,702
Number of share options, vested and expected to vest (in shares) 49,407,492  
Weighted average exercise price, vested and expected to vest (in dollars per share) $ 2.31  
Weighted average remaining contractual term, vested and expected to vest 9 years 3 months 18 days  
Aggregate intrinsic value, vested and expected to vest $ 38,406  
Number of share options, exercisable (in shares) 5,716,319  
Weighted average exercise price, exercisable (in dollars per share) $ 4.89  
Weighted average remaining contractual term, exercisable 7 years 2 months 12 days  
Aggregate intrinsic value, exercisable $ 892  
Performance and market-based stock options    
Number of share options    
Beginning balance (in shares) 6,764,000  
Granted (in shares) 40,835,220  
Forfeited (in shares) (945,000)  
Exercised (in shares) 0  
Ending balance (in shares) 46,654,220 6,764,000
Weighted average exercise price    
Beginning balance (in dollars per share) $ 1.15  
Granted (in dollars per share) 1.69  
Forfeited (in dollars per share) 1.20  
Exercised (in dollars per share) 0  
Ending balance (in dollars per share) $ 1.62 $ 1.15
Stock option activity, additional disclosures    
Weighted average remaining contractual term, options outstanding 9 years 7 months 6 days 9 years 7 months 6 days
Aggregate intrinsic value, options outstanding $ 46,237 $ 20,955
Number of share options, vested and expected to vest (in shares) 8,397,760  
Weighted average exercise price, vested and expected to vest (in dollars per share) $ 1.62  
Weighted average remaining contractual term, vested and expected to vest 9 years 7 months 6 days  
Aggregate intrinsic value, vested and expected to vest $ 8,323  
Number of share options, exercisable (in shares) 0  
Weighted average exercise price, exercisable (in dollars per share) $ 0  
Aggregate intrinsic value, exercisable $ 0