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STOCKHOLDERS' EQUITY - EQUITY PLANS - SCHEDULE OF AGGREGATE OPTION AND AWARD ACTIVITY (Details) - $ / shares
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Shares Available For Grant      
Balance at the beginning of the period (in shares) 6,202,727    
Additional shares authorized (in shares) 14,000,000    
Options granted (in shares) (9,265,000)    
Awards granted (in shares) (139,652)    
Options cancelled/forfeited/expired (in shares) 1,166,324    
Balance at the end of the period (in shares) 11,964,399 6,202,727  
Number of Shares - Options Outstanding      
Balance at the beginning of the period (in shares) 22,408,529    
Options granted (in shares) 9,265,000    
Options exercised (in shares) (3,144,878)    
Options cancelled/forfeited/expired (in shares) (1,242,699)    
Balance at the end of the period (in shares) 27,285,952 22,408,529  
Options exercisable at the end of the period (in shares) 16,464,746 17,249,032 14,074,457
Options fully vested and expected to vest at the end of the period (in shares) 26,293,625    
Weighted Average Exercise Price Per Share - Options Outstanding      
Balance at the beginning of the period (in dollars per share) $ 2.96    
Options granted (in dollars per share) 2.07    
Options exercised (in dollars per share) 2.20    
Options cancelled/forfeited/expired (in dollars per share) 3.48    
Balance at the end of the period (in dollars per share) 2.72 $ 2.96  
Options exercisable at the end of the period (in dollars per share) 3.13 $ 3.03 $ 2.99
Options fully vested and expected to vest at the end of the period (in dollars per share) $ 2.75    
Weight Average Remaining Contractual Life (in years) - Options Outstanding      
Balance at the end of the period 6 years 8 months 15 days    
Options exercisable at the end of the period 5 years 1 month 6 days    
Options fully vested and expected to vest at the end of the period 6 years 7 months 9 days