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STOCK-BASED COMPENSATION - Schedule of Significant Price Ranges of Options Outstanding, Related Weighted Average Exercise Prices and Contractual Life Information (Details)
shares in Thousands
12 Months Ended
Dec. 31, 2017
$ / shares
shares
$0.78  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding (in shares) | shares 4
Weighted Average Remaining Contractual Life 1 year 2 months 1 day
Weighted Average Exercise Price (in dollars per share) $ 0.78
Options Vested and Exercisable (in shares) | shares 4
Weighted Average Exercise Price (in dollars per share) $ 0.78
Range of exercise price, minimum (in dollars per share) $ 0.78
0.86  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding (in shares) | shares 726
Weighted Average Remaining Contractual Life 8 years 8 months 5 days
Weighted Average Exercise Price (in dollars per share) $ 0.86
Options Vested and Exercisable (in shares) | shares 227
Weighted Average Exercise Price (in dollars per share) $ 0.86
Range of exercise price, minimum (in dollars per share) $ 0.86
$0.90 - $1.32  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding (in shares) | shares 359
Weighted Average Remaining Contractual Life 2 years 1 month 10 days
Weighted Average Exercise Price (in dollars per share) $ 0.98
Options Vested and Exercisable (in shares) | shares 327
Weighted Average Exercise Price (in dollars per share) $ 0.94
1.63  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding (in shares) | shares 545
Weighted Average Remaining Contractual Life 1 year 3 months 7 days
Weighted Average Exercise Price (in dollars per share) $ 1.63
Options Vested and Exercisable (in shares) | shares 545
Weighted Average Exercise Price (in dollars per share) $ 1.63
Range of exercise price, minimum (in dollars per share) $ 1.63
$2.17 - $2.65  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding (in shares) | shares 307
Weighted Average Remaining Contractual Life 4 years 5 months 1 day
Weighted Average Exercise Price (in dollars per share) $ 2.25
Options Vested and Exercisable (in shares) | shares 307
Weighted Average Exercise Price (in dollars per share) $ 2.25
2.78  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding (in shares) | shares 958
Weighted Average Remaining Contractual Life 2 years 11 months 9 days
Weighted Average Exercise Price (in dollars per share) $ 2.78
Options Vested and Exercisable (in shares) | shares 958
Weighted Average Exercise Price (in dollars per share) $ 2.78
Range of exercise price, minimum (in dollars per share) $ 2.78
$2.82 - $3.36  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding (in shares) | shares 231
Weighted Average Remaining Contractual Life 5 years 3 months 18 days
Weighted Average Exercise Price (in dollars per share) $ 3.15
Options Vested and Exercisable (in shares) | shares 211
Weighted Average Exercise Price (in dollars per share) $ 3.15
3.39  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding (in shares) | shares 243
Weighted Average Remaining Contractual Life 5 years 11 months 12 days
Weighted Average Exercise Price (in dollars per share) $ 3.39
Options Vested and Exercisable (in shares) | shares 243
Weighted Average Exercise Price (in dollars per share) $ 3.39
Range of exercise price, minimum (in dollars per share) $ 3.39
3.48  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding (in shares) | shares 120
Weighted Average Remaining Contractual Life 3 years 10 months 6 days
Weighted Average Exercise Price (in dollars per share) $ 3.48
Options Vested and Exercisable (in shares) | shares 120
Weighted Average Exercise Price (in dollars per share) $ 3.48
Range of exercise price, minimum (in dollars per share) $ 3.48
3.82  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding (in shares) | shares 65
Weighted Average Remaining Contractual Life 6 years 29 days
Weighted Average Exercise Price (in dollars per share) $ 3.82
Options Vested and Exercisable (in shares) | shares 59
Weighted Average Exercise Price (in dollars per share) $ 3.82
Range of exercise price, minimum (in dollars per share) $ 3.82
$0.78 - $3.82  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding (in shares) | shares 3,558
Weighted Average Remaining Contractual Life 4 years 4 months 2 days
Weighted Average Exercise Price (in dollars per share) $ 2.09
Options Vested and Exercisable (in shares) | shares 3,001
Weighted Average Exercise Price (in dollars per share) $ 2.29
Minimum | $0.90 - $1.32  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of exercise price, minimum (in dollars per share) 0.90
Minimum | $2.17 - $2.65  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of exercise price, minimum (in dollars per share) 2.17
Minimum | $2.82 - $3.36  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of exercise price, minimum (in dollars per share) 2.82
Maximum | $0.90 - $1.32  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of exercise price, maximum (in dollars per share) 1.32
Maximum | $2.17 - $2.65  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of exercise price, maximum (in dollars per share) 2.65
Maximum | $2.82 - $3.36  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of exercise price, maximum (in dollars per share) $ 3.36