Warrants (Schedule Of Changes In Warrants Activity) (Details) - Warrant [Member]	12 Months Ended
	Dec. 31, 2017 $ / shares shares
Warrants [Line Items]
Outstanding, Opening Balance | shares	3,506,679
Granted | shares	0
Exercised | shares	0
Expired | shares	(419,179)
Outstanding, Ending Balance | shares	3,087,500
Weighted average exercise price, Beginning Balance	$ 4.77
Weighted average exercise price, Granted	0
Weighted average exercise price, Exercised	0
Weighted average exercise price, Expired	17.6
Weighted average exercise price, Ending Balance	3.03
Exercise price range, Granted	3.00
Exercise price range, Exercised	0
Exercise price range, Expired	17.6
Minimum [Member]
Warrants [Line Items]
Exercise price range, Beginning Balance	3.00
Exercise price range, Ending Balance	3.00
Maximum [Member]
Warrants [Line Items]
Exercise price range, Beginning Balance	17.60
Exercise price range, Ending Balance	$ 5.00