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STOCK-BASED COMPENSATION - Summary of Stock Options Outstanding (Details)
shares in Thousands
12 Months Ended
Dec. 31, 2019
$ / shares
shares
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Options outstanding, number of shares (shares) | shares 4,097
Options outstanding - weighted- average remaining life 4 years 3 months 18 days
Options outstanding - weighted- average exercise price (usd per share) $ 2.18
Options exercisable - number of shares exercisable (shares) | shares 2,887
Options Exercisable - weighted-average exercise price (usd per share) $ 2.44
$0.64 —– $1.11  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Exercise price range, lower limit (usd per share) 0.64
Exercise price range, upper limit (usd per share) $ 1.11
Options outstanding, number of shares (shares) | shares 774
Options outstanding - weighted- average remaining life 5 years
Options outstanding - weighted- average exercise price (usd per share) $ 0.82
Options exercisable - number of shares exercisable (shares) | shares 518
Options Exercisable - weighted-average exercise price (usd per share) $ 0.78
$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 8 months 12 days
Options outstanding - weighted- average exercise price (usd per share) $ 1.29
Options exercisable - number of shares exercisable (shares) | shares 563
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 1,309
Options outstanding - weighted- average remaining life 4 years 3 months 18 days
Options outstanding - weighted- average exercise price (usd per share) $ 1.31
Options exercisable - number of shares exercisable (shares) | shares 975
Options Exercisable - weighted-average exercise price (usd per share) $ 1.31
$1.37 —– $7.50  
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) $ 7.68
Options outstanding, number of shares (shares) | shares 867
Options outstanding - weighted- average remaining life 3 years 2 months 12 days
Options outstanding - weighted- average exercise price (usd per share) $ 4.18
Options exercisable - number of shares exercisable (shares) | shares 702
Options Exercisable - weighted-average exercise price (usd per share) $ 4.57
$7.68 —– $14.58  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Exercise price range, lower limit (usd per share) 7.68
Exercise price range, upper limit (usd per share) $ 14.58
Options outstanding, number of shares (shares) | shares 147
Options outstanding - weighted- average remaining life 3 years 4 months 24 days
Options outstanding - weighted- average exercise price (usd per share) $ 11.45
Options exercisable - number of shares exercisable (shares) | shares 129
Options Exercisable - weighted-average exercise price (usd per share) $ 11.02