SIGNIFICANT ACCOUNTING POLICIES (Details 2) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Significant Accounting Policies [Line Items]
Net loss	$ (7,239)	$ (59,148)
Balance	(35,442)	(68,470)	$ (29,457)	$ (9,957)
Accumulated Deficit [Member]
Significant Accounting Policies [Line Items]
Net loss	(7,239)	(59,148)
Balance	(303,335)	$ (271,804)	$ (296,096)	$ (212,656)
Previously Reported [Member]
Significant Accounting Policies [Line Items]
Net loss	(9,400)
Balance	(39,439)
Previously Reported [Member] | Accumulated Deficit [Member]
Significant Accounting Policies [Line Items]
Balance	(307,332)
Restatement Adjustment [Member]
Significant Accounting Policies [Line Items]
Net loss	2,161
Balance	3,997
Restatement Adjustment [Member] | Accumulated Deficit [Member]
Significant Accounting Policies [Line Items]
Balance	$ 3,997