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STOCKHOLDERS' EQUITY - STOCK OPTIONS OUTSTANDING (Details)
 12 Months Ended
Dec. 31, 2016
$ / 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 5,668,162
Weighted Average Exercise Price Per Share (in dollars per share) $ 1.45
Weighted Average Remaining Contractual Life (In years) 5 years 10 months 21 days
$1.55 - $2.54  
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) $ 2.54
Options Outstanding  
Number of Shares | shares 5,017,031
Weighted Average Exercise Price Per Share (in dollars per share) $ 2.27
Weighted Average Remaining Contractual Life (In years) 7 years 3 months
$2.74 - $5.01  
Exercise Price Range  
Exercise price, low end of range (in dollars per share) $ 2.74
Exercise price, high end of range (in dollars per share) $ 5.01
Options Outstanding  
Number of Shares | shares 6,347,008
Weighted Average Exercise Price Per Share (in dollars per share) $ 4.55
Weighted Average Remaining Contractual Life (In years) 7 years 3 months 11 days
$5.09 - $9.32  
Exercise Price Range  
Exercise price, low end of range (in dollars per share) $ 5.09
Exercise price, high end of range (in dollars per share) $ 9.32
Options Outstanding  
Number of Shares | shares 2,093,086
Weighted Average Exercise Price Per Share (in dollars per share) $ 5.59
Weighted Average Remaining Contractual Life (In years) 5 years 4 months 10 days
$1.10 - $9.32  
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) $ 9.32
Options Outstanding  
Number of Shares | shares 19,125,287
Weighted Average Exercise Price Per Share (in dollars per share) $ 3.15
Weighted Average Remaining Contractual Life (In years) 6 years 7 months 24 days