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SHAREHOLDERS' EQUITY - Stock Options (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
STOCK BASED COMPENSATION        
Stock options granted (in shares) 5,097,000 3,050,000 375,000  
Exercise price of options granted (in dollars per share) $ 1.22 $ 1.73 $ 1.90  
Exercisable period of options 2 years 7 months 6 days      
Number of common stock reserved for issuance 17,500,000      
Number of shares of common stock reserved for issuance 2,308,550 4,221,023    
Common stock issued 416,587,000 400,339,000    
Maximum number of shares that may be subject to grants of options to an individual in a calendar year 1,000,000      
Shares        
Balance at the beginning of the period (in shares) 5,269,000 4,243,000 4,906,000  
Granted (in shares) 5,097,000 3,050,000 375,000  
Exercised (in shares) (135,000) (535,000) (171,000)  
Forfeited (in shares) (1,968,000) (700,000) (405,000)  
Expired (in shares) (1,251,000) (789,000) (462,000)  
Balance at the end of the period (in shares) 7,012,000 5,269,000 4,243,000 4,906,000
Exercisable at the end of the period (in shares) 919,000      
Weighted Average Exercise Price        
Balance at the beginning of the period (in dollars per share) $ 2.00 $ 2.33 $ 2.45  
Granted (in dollars per share) 1.22 1.73 1.90  
Exercised (in dollars per share) $ 1.02 $ 1.01 $ 1.02  
Proceeds from exercise of stock options $ 138 $ 544 $ 192  
Forfeited (in dollars per share) $ 2.18 $ 2.56 $ 3.99  
Expired (in dollars per share) 1.19 2.90 2.27  
Balance at the end of the period (in dollars per share) 1.55 $ 2.00 $ 2.33 $ 2.45
Exercisable (in dollars per share) $ 3.02      
Weighted Average Remaining Contractual Life        
Outstanding at the end of the period 4 years 2 months 12 days 3 years 2 years 2 years 7 months 6 days
Exercisable period of options 2 years 7 months 6 days      
Intrinsic Value        
Outstanding at the beginning of the period (in dollars) $ 364 $ 1,475 $ 2,564  
Exercised (in dollars) 10 419 195  
Forfeited (in dollars) 2      
Outstanding at the end of the period (in dollars) $ 53 $ 364 $ 1,475 $ 2,564
Granted (in shares) 5,097,000 3,050,000 375,000  
Equity Incentive Plan        
STOCK BASED COMPENSATION        
Common stock issued 135,000 535,000    
Weighted Average Exercise Price        
Exercised (in dollars per share) $ 1.02 $ 1.02    
Proceeds from exercise of stock options $ 100 $ 500    
Employees and Directors        
STOCK BASED COMPENSATION        
Stock options granted (in shares) 5,100,000 3,100,000 400,000  
Exercise price of options granted (in dollars per share) $ 1.22 $ 1.73 $ 1.90  
Shares        
Granted (in shares) 5,100,000 3,100,000 400,000  
Weighted Average Exercise Price        
Granted (in dollars per share) $ 1.22 $ 1.73 $ 1.90  
Intrinsic Value        
Granted (in shares) 5,100,000 3,100,000 400,000  
Vesting period of options 3 years      
Exercise period of options 5 years      
Common Stock and Additional Paid-in Capital        
Shares        
Exercised (in shares) (135,000) (535,000) (182,000)