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STOCK-BASED COMPENSATION PLANS (Details) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2020
STOCK-BASED COMPENSATION PLANS      
Recognized employee stock-based compensation expense $ 8,000,000 $ 9,100,000  
Employee Stock Purchase Plan      
STOCK-BASED COMPENSATION PLANS      
Shares available for grant 397,737    
Weighted-Average Grant Date Fair Value      
Shares available under the plan 3,600,000    
Offering period for the plan (in months) 3 months    
Period of interval between occurrence of purchases (in months) 3 months    
IRS regulated cap for payroll deduction to purchase common stock $ 25,000    
Purchase price expressed as a percentage of fair market value of common stock (as a percent) 90.00%    
Shares issued under ESPP 242,581    
Shares available for purchase under ESPP 397,737    
Minimum | Employee Stock Purchase Plan      
Weighted-Average Grant Date Fair Value      
Eligible service period of employees per week to participate in the plan (in hours) 20 hours    
Eligible service period of employees in a calendar year to participate in the plan (in months) 5 months    
Percentage of employees' eligible earnings as payroll deduction to purchase common stock 1.00%    
Maximum | Employee Stock Purchase Plan      
Weighted-Average Grant Date Fair Value      
Percentage of employees' eligible earnings as payroll deduction to purchase common stock 10.00%    
Restricted Stock Units      
Weighted-Average Grant Date Fair Value      
Weighted-average period to recognize unrecognized compensation cost 1 year 6 months    
Equity Incentive Plan2007      
STOCK-BASED COMPENSATION PLANS      
Additional shares authorized     5,500,000
Shares available for grant 528,995    
Equity Incentive Plan2007 | Maximum      
STOCK-BASED COMPENSATION PLANS      
Expiration period (in years) 10 years    
Equity Incentive Plan2007 | Restricted Stock Units      
STOCK-BASED COMPENSATION PLANS      
Percentage of vesting upon a termination of employment 100.00%    
Percentage of vesting through the fourth anniversary of the grant date 100.00%    
RSU      
Non-vested at the beginning of the period (in shares) 3,921,000 3,820,000  
Granted (in shares) 2,696,000 2,295,000  
Vested (in shares) (1,501,000) (1,409,000)  
Forfeited (in shares) (429,000) (785,000)  
Non-vested at the end of the period (in shares) 4,687,000 3,921,000  
Weighted-Average Grant Date Fair Value      
Non-vested at the beginning of the period (in dollars per share) $ 5.1 $ 4.68  
Granted (in dollars per share) 2.93 4.61  
Vested (in dollars per share) 4.89 4.35  
Forfeited (in dollars per share) 6.35 2.87  
Non-vested at the end of the period (in dollars per share) $ 3.8 $ 5.1  
Total fair value RSUs vested (in dollars) $ 7,300,000 $ 6,100,000  
Unrecognized compensation cost related to the RSUs $ 9,500,000    
Weighted-average period to recognize unrecognized compensation cost 1 year 6 months    
Shares available under the plan 900,000