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STOCK-BASED COMPENSATION - Compensation Awards (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Stock options      
Number of outstanding options      
Balance at the beginning of the period (in shares) 1,155    
Granted (in shares) 116   0
Exercised (in shares) (73)    
Released RSUs/RSAs (in shares) 0    
Forfeited (in shares) (432)    
Balance at the end of the period (in shares) 766 1,155  
Weighted-Average Exercise Price of Outstanding Options      
Balance at the beginning of the period (in dollars per share) $ 22.28    
Granted (in dollars per share) 13.28    
Exercised (in dollars per share) 14.69    
Released RSUs/RSAs (in shares) 0    
Forfeited (in dollars per share) 23.81    
Balance at the end of the period (in dollars per share) $ 20.79 $ 22.28  
Additional disclosures      
Aggregate intrinsic value of options outstanding $ 1.3    
Aggregate intrinsic value of options exercisable $ 0.3    
Weighted average remaining contractual term of options exercisable 4 years 5 months 4 days    
Total intrinsic value of options exercised $ 0.2 $ 0.1 $ 0.2
Total estimated fair value of options vested $ 0.6 $ 0.0 0.0
RSUs      
Number of outstanding RSUs and PSUs/RSAs and PSAs      
Balance at the beginning of the period (in shares) 85    
Granted (in shares) 117    
Exercised (in shares) 0    
Released RSUs and RSAs (in shares) (86)    
Forfeited (in shares) 0    
Balance at the end of the period (in shares) 116 85  
Weighted-Average Fair Value per Share at Grant      
Balance at the beginning of the period (in dollars per share) $ 13.30    
Granted (in dollars per share) 12.81    
Exercised (in dollars per share) 0    
Released RSUs and RSAs (in dollars per share) 13.28    
Forfeited (in dollars per share) 0    
Balance at the end of the period (in dollars per share) $ 12.82 $ 13.30  
Additional disclosures      
Total estimated fair value of equity instruments vested $ 1.1 $ 1.3 1.4
RSAs      
Number of outstanding RSUs and PSUs/RSAs and PSAs      
Balance at the beginning of the period (in shares) 30    
Granted (in shares) 19    
Exercised (in shares) 0    
Released RSUs and RSAs (in shares) (14)    
Forfeited (in shares) (6)    
Balance at the end of the period (in shares) 29 30  
Weighted-Average Fair Value per Share at Grant      
Balance at the beginning of the period (in dollars per share) $ 14.61    
Granted (in dollars per share) 12.44    
Exercised (in dollars per share) 0    
Released RSUs and RSAs (in dollars per share) 14.57    
Forfeited (in dollars per share) 13.80    
Balance at the end of the period (in dollars per share) $ 13.35 $ 14.61  
Additional disclosures      
Total estimated fair value of equity instruments vested $ 0.2 $ 0.6 $ 0.9