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Stockholders' Equity (Schedule Of Warrants) (Details)
shares in Thousands
 6 Months Ended
Jun. 30, 2018
$ / shares
shares
Number of Shares  
Warrants outstanding, Number of Shares, Beginning balance | shares 4,924
Warrants granted, Number of Shares | shares 50
Warrants expired, Number of Shares | shares (1,525)
Warrants outstanding, Number of Shares, Ending balance | shares 3,449
Weighted-Average Exercise Price  
Warrants outstanding, Weighted-Average Exercise Price, Beginning balance | $ / shares $ 0.66
Warrants granted, Weighted-Average Exercise Price | $ / shares 0.25
Warrants expired, Weighted-Average Exercise Price | $ / shares 0.89
Warrants outstanding, Weighted-Average Exercise Price, Ending balance | $ / shares $ 0.55