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STOCK-BASED COMPENSATION PLANS (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
STOCK-BASED COMPENSATION PLANS    
Recognized employee stock-based compensation expense $ 9,600,000 $ 9,900,000
Employee Stock Purchase Plan    
STOCK-BASED COMPENSATION PLANS    
Shares available under the plan 2,400,000  
Shares available for grant 198,946  
Weighted-Average Grant Date Fair Value    
Offering period for the plan 3 months  
Period of interval between occurrence of purchases 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 241,358  
Shares available for purchase under ESPP 198,946  
Minimum | Employee Stock Purchase Plan    
Weighted-Average Grant Date Fair Value    
Eligible service period of employees per week to participate in the plan 20 hours  
Eligible service period of employees in a calendar year to participate in the plan 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%  
Equity Incentive Plan2007    
STOCK-BASED COMPENSATION PLANS    
Shares available for grant 933,848  
Weighted-Average Grant Date Fair Value    
Total fair value RSUs vested (in dollars) $ 10,100,000 $ 7,700,000
Equity Incentive Plan2007 | Maximum    
STOCK-BASED COMPENSATION PLANS    
Anniversary period from the grant date on which the award will expire 10 years  
Equity Incentive Plan2007 | Restricted stock units    
STOCK-BASED COMPENSATION PLANS    
Percentage of relevant period has elapsed for pro rata vesting of the awards 50.00%  
RSA and RSU    
Non-vested at the beginning of the period (in shares) 4,757,000 4,156,000
Granted (in shares) 3,838,000 2,967,000
Vested (in shares) (2,564,000) (2,104,000)
Forfeited (in shares) (456,000) (262,000)
Non-vested at the end of the period (in shares) 5,575,000 4,757,000
Weighted-Average Grant Date Fair Value    
Non-vested at the beginning of the period (in dollars per share) $ 3.98 $ 3.72
Granted (in dollars per share) 2.93 4.14
Vested (in dollars per share) 3.94 3.68
Forfeited (in dollars per share) 4.08 4.13
Non-vested at the end of the period (in dollars per share) $ 3.22 $ 3.98
Unrecognized compensation cost related to the RSUs $ 9,600,000  
Weighted-average period to recognize unrecognized compensation cost 2 years 1 month 6 days  
Equity Incentive Plan2007 | Restricted stock units | Awards Vesting On Employment Through The Fourth Anniversary Of Grant    
STOCK-BASED COMPENSATION PLANS    
Award vesting percentage 100.00%  
Equity Incentive Plan2007 | Restricted stock units | Awards Vesting On Change In Control    
STOCK-BASED COMPENSATION PLANS    
Award vesting percentage 100.00%  
Incentive Plan Amendment    
STOCK-BASED COMPENSATION PLANS    
Additional shares authorized 5,300,000