SIGNIFICANT ACCOUNTING POLICIES (condensed consolidated statements of changes in capital deficiency) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Significant Accounting Policies [Line Items]
Net loss for the nine months ended September 30, 2018	$ (5,322)	$ (11,437)	$ (21,023)	$ (70,135)
Total capital deficiency	(47,943)	(26,071)	(47,943)	(26,071)	$ (29,457)	$ (9,957)
Retained Earnings [Member]
Significant Accounting Policies [Line Items]
Net loss for the nine months ended September 30, 2018			(21,023)	(70,135)
Total capital deficiency	(317,119)	$ (282,791)	(317,119)	$ (282,791)	$ (296,096)	$ (212,656)
Previously Reported [Member]
Significant Accounting Policies [Line Items]
Net loss for the nine months ended September 30, 2018	(15,544)		(36,238)
Total capital deficiency	(64,994)		(64,994)
Previously Reported [Member] | Retained Earnings [Member]
Significant Accounting Policies [Line Items]
Total capital deficiency	(334,170)		(334,170)
Restatement Adjustment [Member]
Significant Accounting Policies [Line Items]
Net loss for the nine months ended September 30, 2018	10,222		15,215
Total capital deficiency	17,051		17,051
Restatement Adjustment [Member] | Retained Earnings [Member]
Significant Accounting Policies [Line Items]
Total capital deficiency	$ 17,051		$ 17,051