v3.26.1
Stock-Based Compensation - Schedule of Stock Option Activity (Details) - 2018 Plan - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward]    
Beginning balance (in shares) 31,138,077  
Options granted (in shares) 7,193,563  
Options exercised (in shares) (2,438)  
Options forfeited (in shares) (1,177,247)  
Ending balance (in shares) 37,151,955 31,138,077
Number of options, exercisable (in shares) 22,929,684  
Number of options, vested and expected to vest (in shares) 37,151,955  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]    
Beginning balance (in dollars per share) $ 6.31  
Options granted (in dollars per share) 1.88  
Options exercised (in dollars per share) 1.94  
Options forfeited (in dollars per share) 4.80  
Ending balance (in dollars per share) 5.50 $ 6.31
Weighted-average exercise price, exercisable (in dollars per share) 7.69  
Weighted-average exercise price, vested and expected to vest (in dollars per share) $ 5.50  
Weighted-average remaining contract term, outstanding (in years) 7 years 4 months 28 days 7 years 2 months 1 day
Weighted-average remaining contract term, granted (in years) 9 years 6 months 3 days  
Weighted-average remaining contract term, exercisable (in years) 6 years 4 months 20 days  
Weighted-average remaining contract term, vested and expected to vest (in years) 7 years 4 months 28 days  
Aggregate intrinsic value, beginning balance $ 97  
Aggregate intrinsic value, ending balance 3,562 $ 97
Aggregate intrinsic value, exercisable 566  
Aggregate intrinsic value, vested and expected to vest $ 3,562