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STOCKHOLDERS' EQUITY - EQUITY PLANS - SCHEDULE OF AGGREGATE OPTION AND AWARD ACTIVITY (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Shares Available For Grant      
Balance at the beginning of the period (in shares) 11,964,399    
Additional shares authorized (in shares) 5,000,000    
Options granted (in shares) (11,735,600)    
Awards granted (in shares) (29,150)    
Options cancelled/forfeited/expired (in shares) 1,207,706    
Balance at the end of the period (in shares) 6,407,355 11,964,399  
Number of Shares - Options Outstanding      
Balance at the beginning of the period (in shares) 27,285,952    
Options granted (in shares) 11,735,600    
Options exercised (in shares) (137,333)    
Options cancelled/forfeited/expired (in shares) (1,270,206)    
Balance at the end of the period (in shares) 37,614,013 27,285,952  
Options exercisable at the end of the period (in shares) 19,915,713 16,464,746 17,249,032
Options fully vested and expected to vest at the end of the period (in shares) 36,293,713    
Weighted Average Exercise Price Per Share - Options Outstanding      
Balance at the beginning of the period (in dollars per share) $ 2.72    
Options granted (in dollars per share) 1.32    
Options exercised (in dollars per share) 1.19    
Options cancelled/forfeited/expired (in dollars per share) 3.50    
Balance at the end of the period (in dollars per share) 2.26 $ 2.72  
Options exercisable at the end of the period (in dollars per share) 2.86 $ 3.13 $ 3.03
Options fully vested and expected to vest at the end of the period (in dollars per share) $ 2.29    
Weight Average Remaining Contractual Life (in years) - Options Outstanding      
Balance at the end of the period 6 years 9 months 29 days    
Options exercisable at the end of the period 4 years 11 months 12 days    
Options fully vested and expected to vest at the end of the period 6 years 9 months    
Aggregate Intrinsic Value - Options Outstanding      
Balance at the end of the period (in dollars) $ 1,800    
Options exercisable at the end of the period (in dollars) 359    
Options fully vested and expected to vest at the end of the period (in dollars) $ 1,698