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STOCK-BASED COMPENSATION Summary of Stock Options Outstanding (Details)
shares in Thousands
3 Months Ended
Mar. 31, 2019
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding - Number of Shares (shares) | shares 5,144
Options Outstanding - Weighted- Average Remaining Life 4 years 10 months
Options Outstanding - Weighted- Average Exercise Price (usd per share) | $ / shares $ 1.94
Options Exercisable - Number of Shares Exercisable (shares) | shares 3,318
Options Exercisable - Weighted-average Exercise Price (usd per share) | $ / shares $ 2.20
$0.27 —– $1.14  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding - Number of Shares (shares) | shares 1,061
Options Outstanding - Weighted- Average Remaining Life 5 years 7 months
Options Outstanding - Weighted- Average Exercise Price (usd per share) | $ / shares $ 0.83
Options Exercisable - Number of Shares Exercisable (shares) | shares 703
Options Exercisable - Weighted-average Exercise Price (usd per share) | $ / shares $ 0.79
$1.29 —– $1.29  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding - Number of Shares (shares) | shares 1,000
Options Outstanding - Weighted- Average Remaining Life 5 years 6 months
Options Outstanding - Weighted- Average Exercise Price (usd per share) | $ / shares $ 1.29
Options Exercisable - Number of Shares Exercisable (shares) | shares 375
Options Exercisable - Weighted-average Exercise Price (usd per share) | $ / shares $ 1.29
$1.31 —– $1.31  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding - Number of Shares (shares) | shares 1,752
Options Outstanding - Weighted- Average Remaining Life 5 years
Options Outstanding - Weighted- Average Exercise Price (usd per share) | $ / shares $ 1.31
Options Exercisable - Number of Shares Exercisable (shares) | shares 1,230
Options Exercisable - Weighted-average Exercise Price (usd per share) | $ / shares $ 1.31
$1.37 —– $6.98  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding - Number of Shares (shares) | shares 1,034
Options Outstanding - Weighted- Average Remaining Life 3 years 10 months
Options Outstanding - Weighted- Average Exercise Price (usd per share) | $ / shares $ 2.90
Options Exercisable - Number of Shares Exercisable (shares) | shares 713
Options Exercisable - Weighted-average Exercise Price (usd per share) | $ / shares $ 3.03
$7.01 —– $12.57  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding - Number of Shares (shares) | shares 297
Options Outstanding - Weighted- Average Remaining Life 2 years 2 months
Options Outstanding - Weighted- Average Exercise Price (usd per share) | $ / shares $ 8.40
Options Exercisable - Number of Shares Exercisable (shares) | shares 297
Options Exercisable - Weighted-average Exercise Price (usd per share) | $ / shares $ 8.40