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STOCK-BASED COMPENSATION Summary of Stock Option Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Number of Shares Outstanding      
Outstanding, beginning balance (in shares) 8,426 8,730 8,170
Granted (in shares) 213 4,500 2,440
Exercised (in shares) (1,346) (425) (375)
Canceled (in shares) (521) (4,379) (1,505)
Outstanding, ending balance (in shares) 6,772 8,426 8,730
Shares outstanding, vested and expected to vest (in shares) 6,772    
Shares outstanding, exercisable (in shares) 4,645    
Weighted- Average Exercise Price per Share      
Outstanding, beginning balance (in usd per share) $ 1.77 $ 4.55 $ 5.36
Granted (in usd per share) 4.43 1.22 2.12
Exercised (in usd per share) 1.75 0.51 0.39
Canceled (in usd per share) 2.94 6.91 6.01
Outstanding, ending balance (in usd per share) 1.76 $ 1.77 $ 4.55
Weighted-average exercise price, vested and expected (in usd per share) 1.76    
Weighted-average exercise price, exercisable (in usd per share) $ 1.87    
Weighted-Average Remaining Contractual Term      
Outstanding 4 years 3 months    
Vested and expected to vest 4 years 3 months    
Exercisable 3 years 6 months    
Aggregate Intrinsic Value      
Exercised $ 5,096 $ 544 $ 729
Outstanding 21,547    
Vested and expected to vest 21,547    
Exercisable $ 14,670    
Share Price $ 4.73