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STOCK-BASED COMPENSATION - Options activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Options Outstanding      
Outstanding at beginning of period (in shares) 4,695,619    
Options granted (in shares) 0    
Options exercised (in shares) (32,290) 0  
Outstanding at end of period (in shares) 4,663,329   4,695,619
Exercisable at end of period (in shares) 4,371,160    
Nonvested at end of period (in shares) 292,169    
Weighted-Average Exercise Price      
Outstanding at beginning of period (in dollars per share) $ 2.01    
Options exercised (in dollars per share) 1.05    
Outstanding at end of period (in dollars per share) 2.01   $ 2.01
Exercisable at end of period (in dollars per share) 2.08    
Nonvested at end of period (in dollars per share) $ 1.05    
Weighted-Average Remaining Contractual Term-in years      
Outstanding 5 years 1 month 6 days   5 years 10 months 24 days
Exercisable 5 years 1 month 6 days    
Nonvested 7 years 6 months    
Aggregate Intrinsic Value      
Options exercised (in dollars) $ 200    
Outstanding (in dollars) 22,318   $ 7,875
Exercisable (in dollars) 20,638    
Nonvested (in dollars) 1,680    
Grant-date fair value of stock options vested during the period $ 36 $ 100