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STOCKHOLDERS' EQUITY - EQUITY PLANS (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Oct. 31, 2018
May 15, 2018
STOCKHOLDERS' EQUITY          
Common stock, shares newly reserved for future issuance 40,665,152        
Aggregate Intrinsic Value - Options Outstanding          
Closing stock price (in dollars per share) $ 1.00        
Total pretax intrinsic value of stock options exercised (in dollars) $ 8,812,000 $ 15,000 $ 595,000    
Cash received from exercise of options (in dollars) $ 6,929,000 $ 18,000 $ 493,000    
Number of Shares - Options Outstanding          
Options exercisable at the end of the period (in shares) 16,464,746 17,249,032 14,074,457    
Weighted Average Exercise Price Per Share - Options Outstanding          
Options exercisable at the end of the period (in dollars per share) $ 3.13 $ 3.03 $ 2.99    
2002 Plan          
STOCKHOLDERS' EQUITY          
Vesting period of options 4 years        
Exercise price as a percentage of fair market value 100.00%        
2002 Plan | Maximum          
STOCKHOLDERS' EQUITY          
Expiration term of options from date of grant 10 years        
2011 Plan          
STOCKHOLDERS' EQUITY          
Vesting period of options 4 years        
2011 Plan | Maximum          
STOCKHOLDERS' EQUITY          
Expiration term of options from date of grant 10 years        
2018 Plan          
STOCKHOLDERS' EQUITY          
Vesting period of options 4 years        
Common stock, shares newly reserved for future issuance         10,000,000
Minimum percentage of ownership required for granting options at least 110% of fair market value of common stock 10.00%        
Minimum exercise price as a percentage of fair market value for employees having more than 10 % outstanding common stock 110.00%        
Maximum expiration term of options granted to employees having more than 10 % outstanding common stock 5 years        
2018 Plan | First Director Option          
STOCKHOLDERS' EQUITY          
Vesting period of options 3 years        
Options to be granted to purchase shares upon appointment (shares) 120,000        
2018 Plan | Subsequent Director Option          
STOCKHOLDERS' EQUITY          
Options to be granted to purchase shares (in shares) 70,000        
2018 Plan | Maximum          
STOCKHOLDERS' EQUITY          
Expiration term of options from date of grant 10 years        
2006 Directors Plan | First Director Option          
STOCKHOLDERS' EQUITY          
Vesting period of options 3 years        
2006 Directors Plan | Subsequent Director Option          
STOCKHOLDERS' EQUITY          
Vesting period of options 1 year        
2006 Directors Plan | Maximum          
STOCKHOLDERS' EQUITY          
Expiration term of options from date of grant 10 years        
2018 Inducement Award Plan          
STOCKHOLDERS' EQUITY          
Common stock, shares newly reserved for future issuance 3,000,000        
Directors’ Market Value Stock Purchase Plan          
STOCKHOLDERS' EQUITY          
Common stock, shares newly reserved for future issuance       1,000,000