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STOCK-BASED COMPENSATION - Stock Options Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Number of options    
Beginning balance (in shares) 10,300,567  
Granted (in shares) 2,921,082  
Exercised (in shares) (93,973)  
Forfeited (in shares) (251,530)  
Ending balance (in shares) 12,876,146 10,300,567
Exercisable (in shares) 10,825,039  
Unvested (in shares) 2,051,107  
Weighted  average  exercise  price  ($)    
Beginning balance (in usd per share) $ 1.73  
Granted (in usd per share) 1.30  
Exercised (in usd per share) 0.89  
Forfeited (in usd per share) 3.68  
Ending balance (in usd per share) 1.60 $ 1.73
Exercisable (in usd per share) 1.38  
Unvested (in usd per share) $ 4.10  
Weighted average remaining contractual term (years)    
Balance 6 years 9 months 10 days 6 years 9 months 21 days
Exercisable 6 years 5 months 1 day  
Unvested 8 years 8 months 15 days  
Aggregate intrinsic value ($)    
Balance $ 897 $ 0
Exercised 46  
Exercisable 824  
Unvested $ 73