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
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Class of Warrant or Right [Line Items]    
Trading market prices $ 1.80 $ 1.91
Estimated future volatility 100.00% 102.00%
Dividend
Fundamental transaction likelihood 50.00% 50.00%
Fundamental transaction timing 2020-07 2020-04
Minimum [Member]    
Class of Warrant or Right [Line Items]    
Estimated future risk-free rate 0.20% 1.57%
Equivalent volatility 113.00% 85.00%
Equivalent risk-free rate 0.13% 1.57%
Maximum [Member]    
Class of Warrant or Right [Line Items]    
Estimated future risk-free rate 0.41% 1.72%
Equivalent volatility 129.00% 94.00%
Equivalent risk-free rate 0.19% 1.59%