Annual report pursuant to Section 13 and 15(d)

Warrants (Summary Of Changes In Warrants Outstanding During The Period) (Details)

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Warrants (Summary Of Changes In Warrants Outstanding During The Period) (Details) - $ / shares
 12 Months Ended
Oct. 17, 2017
Jun. 12, 2017
Sep. 19, 2016
Mar. 02, 2016
Nov. 12, 2015
Dec. 31, 2017
Dec. 31, 2016
Warrants [Abstract]              
Number of warrants, Outstanding           5,452,691 2,649,199
Weigted average exercise price, Outstanding           $ 4.92 $ 7.97
Number of warrants, issued 1,632,654 1,515,152 1,800,000 1,171,875 1,250,000 3,525,543 3,194,000
Weighted average exercise price, Issued           $ 3.42 $ 3.47
Number of warrants, Exercised           (1,861,195)  
Weighted average exercise price, Exercised           $ 3.51  
Number of warrants, Expired           (17,430) (390,508)
Weighted average exercise price, Expired           $ 4.72 $ 13.72
Number of warrants, Outstanding           7,099,609 5,452,691
Weigted average exercise price, Outstanding           $ 4.55 $ 4.92