NET (LOSS) INCOME PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
NET (LOSS) INCOME PER SHARE
Net loss	$ (13,290)	$ (8,072)	$ (23,881)	$ (12,800)
Weighted average number of common shares	337,100	314,077	337,083	307,445
Diluted shares outstanding	337,100	314,077	337,083	307,445
Net loss per share:
Basic (in dollars per share)	$ (0.04)	$ (0.03)	$ (0.07)	$ (0.04)
Diluted (in dollars per share)	$ (0.04)	$ (0.03)	$ (0.07)	$ (0.04)