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Stockholders' Equity (Schedule Of Stock Option Activity) (Details)
shares in Thousands
 6 Months Ended
Jun. 30, 2018
$ / shares
shares
Number of Shares  
Options outstanding, Number of Shares, Beginning Balance | shares 8,745
Options granted, Number of Shares | shares 770
Options expired/forfeited, Number of Shares | shares (1,114)
Options outstanding, Number of Shares, Ending Balance | shares 8,401
Weighted-Average Exercise Price  
Options outstanding, Weighted-Average Exercise Price, Beginning Balance | $ / shares $ 1.39
Options granted, Weighted-Average Exercise Price | $ / shares 0.25
Options expired/forfeited, Weighted Average Exercise Price | $ / shares 1.35
Options outstanding, Weighted-Average Exercise Price, Ending Balance | $ / shares $ 1.29