STOCK-BASED COMPENSATION - SUMMARY OF STOCK OPTIONS (Details)	9 Months Ended
	Sep. 30, 2017 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, beginning of period (in shares) | shares	3,752,209
Granted (in shares) | shares	628,000
Exercised (in shares) | shares	(104,500)
Canceled and forfeited (in shares) | shares	(196,803)
Outstanding, end of period (in shares) | shares	4,078,906
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding, beginning of period (in dollars per share) | $ / shares	$ 3.04
Granted (in dollars per share) | $ / shares	3.26
Exercised (in dollars per share) | $ / shares	2.64
Canceled and forfeited (in dollars per share) | $ / shares	4.99
Outstanding, end of period (in dollars per share) | $ / shares	$ 2.99