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STOCKHOLDERS' EQUITY - Schedule of Stock Option Activity (Details) - Stock Option Plans - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Number of Shares Subject to Issuance    
Outstanding, beginning balance (in shares) 1,152,714  
Granted (in shares) 519,750  
Forfeited, cancelled, or expired (in shares) (184,582)  
Outstanding, ending balance (in shares) 1,487,882 1,152,714
Exercisable at end of period (in shares) 484,004  
Weighted- average Exercise Price    
Outstanding, beginning balance (in dollars per share) $ 3.07  
Granted (in dollars per share) 1.92  
Forfeited, cancelled, or expired (in dollars per share) 2.68  
Outstanding, ending balance (in dollars per share) 2.05 $ 3.07
Exercisable at end of period (in dollars per share) $ 3.66  
Weighted- average Remaining Contractual Term    
Outstanding 2 years 3 months 10 days 3 years 2 months 4 days
Exercisable at end of period 3 years 3 months 10 days  
Aggregate Intrinsic Value    
Outstanding $ 883 $ 38
Exercisable at end of period $ 471