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STOCKHOLDERS' EQUITY - EQUITY PLANS (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 30, 2016
Shares Available For Grant        
Balance at the beginning of the period (in shares) 12,054,916      
Options granted (in shares) (2,834,000)      
Awards granted (in shares) (21,541)      
Options cancelled/forfeited (in shares) 371,160      
Balance at the end of the period (in shares) 9,570,535 12,054,916    
Number of Shares        
Balance at the beginning of the period (in shares) 17,205,683      
Options granted (in shares) 2,834,000      
Options exercised (in shares) (328,486)      
Options cancelled/forfeited (in shares) (585,910)      
Balance at the end of the period (in shares) 19,125,287 17,205,683    
Options exercisable at the end of the period (in shares) 14,074,457 11,356,232 9,129,576  
Options fully vested and expected to vest at the end of the period (in shares) 18,694,300      
Weighted Average Exercise Price Per Share        
Balance at the beginning of the period (in dollars per share) $ 3.29      
Options granted (in dollars per share) 2.56      
Options exercised (in dollars per share) 1.50      
Options cancelled/forfeited (in dollars per share) 5.34      
Balance at the end of the period (in dollars per share) 3.15 $ 3.29    
Options exercisable at the end of the period (in dollars per share) 2.99 $ 2.98 $ 3.12  
Options fully vested and expected to vest at the end of the period (in dollars per share) $ 3.14      
Weighted Average Remaining Contractual Life (In years)        
Balance at the end of the period 6 years 7 months 24 days      
Options exercisable at the end of the period 6 years 18 days      
Options fully vested and expected to vest at the end of the period 6 years 7 months 6 days      
Aggregate Intrinsic Value        
Balance at the end of the period (in dollars) $ 3,816,000      
Options exercisable at the end of the period (in dollars) 3,718,000      
Options fully vested and expected to vest at the end of the period (in dollars) 3,815,000      
Closing stock price (in dollars per share)       $ 2.07
Total pretax intrinsic value of stock options exercised (in dollars) 595,000 $ 2,398,000 $ 989,000  
Cash received from exercise of options (in dollars) $ 493,000 $ 2,205,000 $ 1,286,000  
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) 9,570,535      
2011 Plan | Maximum        
STOCKHOLDERS' EQUITY        
Expiration term of options from date of grant 10 years      
2011 Plan | First Director Option        
STOCKHOLDERS' EQUITY        
Vesting period of options 3 years      
Options to be granted to purchase shares upon appointment (in shares) 100,000      
2011 Plan | Subsequent Director Option        
STOCKHOLDERS' EQUITY        
Options to be granted to purchase shares (in shares) 50,000      
2006 Directors 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