CONVERTIBLE NOTES (Schedule Of Debt Interest Expenses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Gain (Loss) on extinguishment	$ 1,325	$ (14,063)
Change in fair value of convertible note embedded derivative	(38,061)	(6,473)
2016 Notes [Member]
Contractual interest expense	4,434	313
Debt discount (premium) amortization	2,309	147
Gain (Loss) on extinguishment		(14,063)
Change in fair value of convertible note embedded derivative	38,061	6,473
Interest payment in connection with conversions	3,918
Income in connection with conversions	(1,643)
Total	47,079	$ (7,130)
Notes 2017 [Member]
Contractual interest expense	55
Debt discount (premium) amortization	(46)
Gain (Loss) on extinguishment	1,325
Total	$ 1,334