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STOCK-BASED COMPENSATION - Performance-based Stock Options Restricted Stock Units (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting and settlement value   $ 7,898 $ 838
Performance Based Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Risk-free interest rate     2.84%
Expected option term (in years)     3 years 3 months
Weighted-average exercise price (in dollars per share)     $ 2.63
Expected stock price volatility     95.50%
Dividend yield     0.00%
Performance Based Stock Options | The 2014 Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (in shares)     1,000,000
Term of awards (may not exceed) (in years)   10 years  
Fair value of units awarded at grant date (in dollars per share)     $ 1.80
Performance-based Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected option term (in years)     3 years 3 months
Performance-based Restricted Stock Units | The 2014 Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (in shares)     1,000,000
Fair value of units awarded at grant date (in dollars per share)     $ 2.24
Performance stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Settlement of employee equity awards (in shares) 500,000    
Total fair value of awards vested   $ 4,000  
Service period   1 year  
Restricted stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares outstanding value (in shares) 300,000    
Employee’s tax withholding liability (in shares) 200,000    
Total fair value of awards vested $ 2,600    
Restricted stock units | The 2014 Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (in shares)   977,425  
Fair value of units awarded at grant date (in dollars per share)   $ 3.62 $ 2.92
Shares outstanding value (in shares)   1,388,011  
Total fair value of awards vested   $ 4,000 $ 4,100
ESPP      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting and settlement value $ 3,400