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NET LOSS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share
Net loss	$ (25,132)	$ (11,465)	$ (13,014)	$ (10,136)	$ (20,989)	$ (13,290)	$ (5,380)	$ (5,211)	$ (59,747)	$ (44,870)	$ (10,634)
Weighted average common shares outstanding:									361,845,000	337,297,000	313,887,000
Diluted shares outstanding:									361,845,000	337,297,000	313,887,000
Net loss per share:
Basic and Diluted (in dollars per share)	$ (0.07)	$ (0.03)	$ (0.04)	$ (0.02)	$ (0.06)	$ (0.04)	$ (0.02)	$ (0.02)	$ (0.17)	$ (0.13)	$ (0.03)
Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share
Options outstanding not included in the computation of diluted weighted average shares because their effect would have been anti-dilutive (in shares)									29,770,766		10,350,000
Price per common share for each warrant											$ 2.70
Warrants \| Minimum
Antidilutive Securities Excluded from Computation of Earnings Per Share
Price per common share for each warrant	1.72								$ 1.72
Warrants \| Maximum
Antidilutive Securities Excluded from Computation of Earnings Per Share
Price per common share for each warrant	$ 2.00								$ 2.00