Quarterly report pursuant to Section 13 or 15(d)

Warrants (Schedule Of Assumptions Used In Calculating Fair Value Of Warrants) (Details)

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Warrants (Schedule Of Assumptions Used In Calculating Fair Value Of Warrants) (Details) - $ / shares
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Class of Warrant or Right [Line Items]    
Trading market prices $ 5.16 $ 11.16
Estimated future volatility 102.00% 105.00%
Dividend
Estimated additional shares to be issued upon dilutive event 5.00% 5.00%
Minimum [Member]    
Class of Warrant or Right [Line Items]    
Estimated future risk-free rate 1.59% 2.35%
Equivalent volatility 84.00% 99.00%
Equivalent risk-free rate 1.86% 2.51%
Maximum [Member]    
Class of Warrant or Right [Line Items]    
Estimated future risk-free rate 1.76% 2.53%
Equivalent volatility 87.00% 104.00%
Equivalent risk-free rate 1.98% 2.55%