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STOCK-BASED COMPENSATION - Summary of Stock Options Outstanding (Details)
shares in Thousands
3 Months Ended
Mar. 31, 2020
$ / shares
shares
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Options outstanding, number of shares (shares) | shares 3,483
Options outstanding - weighted- average remaining life 4 years 2 months 12 days
Options outstanding - weighted- average exercise price (usd per share) $ 2.01
Options exercisable - number of shares exercisable (shares) | shares 2,518
Options Exercisable - weighted-average exercise price (usd per share) $ 2.22
$0.70 —– $1.11  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Exercise price range, lower limit (usd per share) 0.70
Exercise price range, upper limit (usd per share) $ 1.11
Options outstanding, number of shares (shares) | shares 751
Options outstanding - weighted- average remaining life 4 years 9 months 18 days
Options outstanding - weighted- average exercise price (usd per share) $ 0.82
Options exercisable - number of shares exercisable (shares) | shares 565
Options Exercisable - weighted-average exercise price (usd per share) $ 0.80
$1.29 —– $1.29  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Exercise price range, lower limit (usd per share) 1.29
Exercise price range, upper limit (usd per share) $ 1.29
Options outstanding, number of shares (shares) | shares 1,000
Options outstanding - weighted- average remaining life 4 years 6 months
Options outstanding - weighted- average exercise price (usd per share) $ 1.29
Options exercisable - number of shares exercisable (shares) | shares 625
Options Exercisable - weighted-average exercise price (usd per share) $ 1.29
$1.31 —– $1.31  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Exercise price range, lower limit (usd per share) 1.31
Exercise price range, upper limit (usd per share) $ 1.31
Options outstanding, number of shares (shares) | shares 1,037
Options outstanding - weighted- average remaining life 4 years
Options outstanding - weighted- average exercise price (usd per share) $ 1.31
Options exercisable - number of shares exercisable (shares) | shares 765
Options Exercisable - weighted-average exercise price (usd per share) $ 1.31
$1.37 —– $12.57  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Exercise price range, lower limit (usd per share) 1.37
Exercise price range, upper limit (usd per share) $ 12.57
Options outstanding, number of shares (shares) | shares 653
Options outstanding - weighted- average remaining life 3 years 3 months 18 days
Options outstanding - weighted- average exercise price (usd per share) $ 4.78
Options exercisable - number of shares exercisable (shares) | shares 527
Options Exercisable - weighted-average exercise price (usd per share) $ 5.34
$14.58 —– $14.58  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Exercise price range, lower limit (usd per share) 14.58
Exercise price range, upper limit (usd per share) $ 14.58
Options outstanding, number of shares (shares) | shares 42
Options outstanding - weighted- average remaining life 6 years 1 month 6 days
Options outstanding - weighted- average exercise price (usd per share) $ 14.58
Options exercisable - number of shares exercisable (shares) | shares 36
Options Exercisable - weighted-average exercise price (usd per share) $ 14.58