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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Number of Shares Outstanding      
Outstanding, beginning balance (in shares) 6,772 8,426 8,730
Granted (in shares) 43 213 4,500
Exercised (in shares) (2,616) (1,346) (425)
Canceled (in shares) (102) (521) (4,379)
Outstanding, ending balance (in shares) 4,097 6,772 8,426
Shares outstanding, vested and expected to vest (in shares) 4,097    
Shares outstanding, exercisable (in shares) 2,887    
Weighted- Average Exercise Price per Share      
Outstanding, beginning balance (in usd per share) $ 1.76 $ 1.77 $ 4.55
Granted (in usd per share) 14.58 4.43 1.22
Exercised (in usd per share) 1.22 1.75 0.51
Canceled (in usd per share) 4.07 2.94 6.91
Outstanding, ending balance (in usd per share) 2.18 $ 1.76 $ 1.77
Weighted-average exercise price, vested and expected (in usd per share) 2.18    
Weighted-average exercise price, exercisable (in usd per share) $ 2.44    
Weighted-Average Remaining Contractual Term      
Outstanding 4 years 3 months 18 days    
Vested and expected to vest 4 years 3 months 18 days    
Exercisable 4 years 1 month 6 days    
Aggregate Intrinsic Value      
Exercised $ 31,093 $ 5,096 $ 544
Outstanding 98,103    
Vested and expected to vest 98,103    
Exercisable $ 68,397    
Share price (in USD per share) $ 26.13