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STOCKHOLDERS' EQUITY - STOCK OPTIONS OUTSTANDING (Details)
 12 Months Ended
Dec. 31, 2017
$ / shares
shares
$1.10 - $1.51  
Exercise Price Range  
Exercise price, low end of range (in dollars per share) $ 1.10
Exercise price, high end of range (in dollars per share) $ 1.51
Options Outstanding  
Number of Shares | shares 5,655,662
Weighted Average Exercise Price Per Share (in dollars per share) $ 1.45
Weighted Average Remaining Contractual Life (In years) 4 years 10 months 20 days
$1.55 - $2.16  
Exercise Price Range  
Exercise price, low end of range (in dollars per share) $ 1.55
Exercise price, high end of range (in dollars per share) $ 2.16
Options Outstanding  
Number of Shares | shares 5,631,031
Weighted Average Exercise Price Per Share (in dollars per share) $ 2.08
Weighted Average Remaining Contractual Life (In years) 7 years 14 days
$2.22 - $4.34  
Exercise Price Range  
Exercise price, low end of range (in dollars per share) $ 2.22
Exercise price, high end of range (in dollars per share) $ 4.34
Options Outstanding  
Number of Shares | shares 6,000,783
Weighted Average Exercise Price Per Share (in dollars per share) $ 3.37
Weighted Average Remaining Contractual Life (In years) 7 years 7 months 6 days
$4.42 - $7.31  
Exercise Price Range  
Exercise price, low end of range (in dollars per share) $ 4.42
Exercise price, high end of range (in dollars per share) $ 7.31
Options Outstanding  
Number of Shares | shares 5,121,053
Weighted Average Exercise Price Per Share (in dollars per share) $ 5.10
Weighted Average Remaining Contractual Life (In years) 5 years 3 months 7 days
$1.10 - $7.31  
Exercise Price Range  
Exercise price, low end of range (in dollars per share) $ 1.10
Exercise price, high end of range (in dollars per share) $ 7.31
Options Outstanding  
Number of Shares | shares 22,408,529
Weighted Average Exercise Price Per Share (in dollars per share) $ 2.96
Weighted Average Remaining Contractual Life (In years) 6 years 2 months 26 days