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STOCKHOLDERS' EQUITY - EQUITY PLANS (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 29, 2017
Shares Available For Grant        
Balance at the beginning of the period (in shares) 9,570,535      
Options granted (in shares) (3,484,000)      
Awards granted (in shares) (72,066)      
Options cancelled/forfeited (in shares) 188,258      
Balance at the end of the period (in shares) 6,202,727 9,570,535    
Number of Shares - Options Outstanding        
Balance at the beginning of the period (in shares) 19,125,287      
Options granted (in shares) 3,484,000      
Options exercised (in shares) (12,500)      
Options cancelled/forfeited (in shares) (188,258)      
Balance at the end of the period (in shares) 22,408,529 19,125,287    
Options exercisable at the end of the period (in shares) 17,249,032 14,074,457 11,356,232  
Options fully vested and expected to vest at the end of the period (in shares) 22,171,142      
Weighted Average Exercise Price Per Share - Options Outstanding        
Balance at the beginning of the period (in dollars per share) $ 3.15      
Options granted (in dollars per share) 2.19      
Options exercised (in dollars per share) 1.41      
Options cancelled/forfeited (in dollars per share) 7.99      
Balance at the end of the period (in dollars per share) 2.96 $ 3.15    
Options exercisable at the end of the period (in dollars per share) 3.03 $ 2.99 $ 2.98  
Options fully vested and expected to vest at the end of the period (in dollars per share) $ 2.96      
Weight Average Remaining Contractual Life (in years) - Options Outstanding        
Balance at the end of the period 6 years 2 months 26 days      
Options exercisable at the end of the period 5 years 6 months 25 days      
Options fully vested and expected to vest at the end of the period 6 years 2 months 15 days      
Aggregate Intrinsic Value - Options Outstanding        
Balance at the end of the period (in dollars) $ 2,034,000      
Options exercisable at the end of the period (in dollars) 2,034,000      
Options fully vested and expected to vest at the end of the period (in dollars) 2,034,000      
Closing stock price (in dollars per share)       $ 1.80
Total pretax intrinsic value of stock options exercised (in dollars) 15,000 $ 595,000 $ 2,398,000  
Cash received from exercise of options (in dollars) $ 18,000 $ 493,000 $ 2,205,000  
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      
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      
Shares Available For Grant        
Balance at the end of the period (in shares) 6,202,727      
2011 Plan | First Director Option        
STOCKHOLDERS' EQUITY        
Vesting period of options 3 years      
Options to be granted to purchase shares upon appointment (shares) 100,000      
2011 Plan | Subsequent Director Option        
STOCKHOLDERS' EQUITY        
Options to be granted to purchase shares (in shares) 50,000      
2011 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