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STOCK-BASED COMPENSATION - Summary of Stock Options Outstanding (Details)
shares in Thousands
6 Months Ended
Jun. 30, 2021
$ / shares
shares
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Options outstanding, number of shares (shares) | shares 2,332
Options outstanding - weighted- average remaining life 3 years 3 months 18 days
Options outstanding - weighted- average exercise price (usd per share) $ 1.96
Options exercisable - number of shares exercisable (shares) | shares 2,231
Options Exercisable - weighted-average exercise price (usd per share) $ 1.97
$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 512
Options outstanding - weighted- average remaining life 3 years 9 months 18 days
Options outstanding - weighted- average exercise price (usd per share) $ 0.85
Options exercisable - number of shares exercisable (shares) | shares 501
Options Exercisable - weighted-average exercise price (usd per share) $ 0.85
$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 3 years 2 months 12 days
Options outstanding - weighted- average exercise price (usd per share) $ 1.29
Options exercisable - number of shares exercisable (shares) | shares 937
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 556
Options outstanding - weighted- average remaining life 2 years 9 months 18 days
Options outstanding - weighted- average exercise price (usd per share) $ 1.31
Options exercisable - number of shares exercisable (shares) | shares 556
Options Exercisable - weighted-average exercise price (usd per share) $ 1.31
$1.39 —– $14.58  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Exercise price range, lower limit (usd per share) 1.39
Exercise price range, upper limit (usd per share) $ 14.58
Options outstanding, number of shares (shares) | shares 253
Options outstanding - weighted- average remaining life 3 years 4 months 24 days
Options outstanding - weighted- average exercise price (usd per share) $ 5.64
Options exercisable - number of shares exercisable (shares) | shares 226
Options Exercisable - weighted-average exercise price (usd per share) $ 5.90
$64.17 —– $64.17  
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]  
Exercise price range, lower limit (usd per share) 64.17
Exercise price range, upper limit (usd per share) $ 64.17
Options outstanding, number of shares (shares) | shares 11
Options outstanding - weighted- average remaining life 5 years 10 months 24 days
Options outstanding - weighted- average exercise price (usd per share) $ 64.17
Options exercisable - number of shares exercisable (shares) | shares 11
Options Exercisable - weighted-average exercise price (usd per share) $ 64.17