Quarterly report pursuant to Section 13 or 15(d)

STOCK BASED COMPENSATION - Stock Options (Details)

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STOCK BASED COMPENSATION - Stock Options (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Number of Shares      
Outstanding at beginning of period (in shares) 6,164    
Forfeited/expired (in shares) (177)    
Outstanding as of end of period (in shares) 5,987   6,164
Options vested as of end of period (in shares) 5,804    
Options vested or expected to vest as of end of period (in shares) 5,986    
Weighted-Average Exercise Price per share      
Outstanding at beginning of period (in dollars per share) $ 1.83    
Forfeited/expired (in dollars per share) 1.40    
Outstanding at end of period (in dollars per share) 1.83   $ 1.83
Options vested at end of period (in dollars per share) 1.85    
Options vested or expected to vest at end of period $ 1.83    
Options vested at end of period (in years) 4 years 7 months 20 days    
Aggregate intrinsic value of options vested or expected to vest $ 210    
Aggregate intrinsic value of options vested $ 210    
Options vested or expected to vest at end of period (in years) 4 years 8 months 8 days    
Aggregate intrinsic value of options outstanding $ 210   $ 140
Weighted-average remaining contractual term (in years) 4 years 8 months 8 days   4 years 11 months 19 days
Exercise of Common Stock options (in shares) 0    
Aggregate intrinsic value of options exercised $ 0 $ 500  
Stock-based compensation expense 7,838 9,313  
Unrecognized stock-based compensation expense, stock options $ 300    
Weighted-average period 4 months 24 days    
Employee Stock Option [Member]      
Weighted-Average Exercise Price per share      
Stock-based compensation expense $ 300 $ 400