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Stockholders' Equity (Schedule Of Warrants) (Details) shares in Thousands | 6 Months Ended
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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

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