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STOCKHOLDERS' EQUITY - Schedule of Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Number of Option Shares    
Outstanding at beginning of period (in shares) 4,270,544  
Granted (in shares) 1,119,039  
Forfeited (in shares) (556,235)  
Expired (in shares) (17,801)  
Exercised (in shares) 0  
Outstanding at ending of period (in shares) 4,815,547 4,270,544
Options exercisable at ending of period (in shares) 2,299,367  
Weighted-Average Exercise Price    
Outstanding at beginning of period (in dollars per share) $ 9.98  
Granted (in dollars per share) 1.89  
Forfeited (in dollars per share) 9.62  
Expired (in dollars per share) 12.54  
Exercised (in dollars per share) 0  
Outstanding at ending of period (in dollars per share) 8.13 $ 9.98
Options exercisable at ending of period (in dollars per share) $ 10.38  
Weighted-Average Contractual Term (in years) and Aggregate Intrinsic Value (in thousands)    
Outstanding, weighted-average contractual term (in years) 7 years 7 months 6 days 8 years 6 months
Options exercisable, outstanding, weighted-average contractual term (in years) 6 years 4 months 24 days  
Outstanding, aggregate intrinsic value $ 0 $ 0
Options exercisable, aggregate intrinsic value $ 0