Registration of securities issued in business combination transactions

Warrants (Summary Of Changes In Warrants Outstanding During The Period) (Details)

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Warrants (Summary Of Changes In Warrants Outstanding During The Period) (Details) - $ / shares
 6 Months Ended 12 Months Ended
Jan. 25, 2019
Oct. 19, 2018
Jun. 30, 2020
Dec. 31, 2019
Class of Warrant or Right [Line Items]        
Number of warrants, Outstanding     1,921,489 1,065,286
Number of warrants, issued 895,886 480,771 895,886
Number of warrants, Exercised    
Number of warrants, Expired     (39,683)
Number of warrants, Outstanding     1,921,489 1,921,489
Weigted average exercise price, Outstanding     $ 22.10 $ 37.52
Weighted average exercise price, Issued     9.60
Weighted average exercise price, Exercised    
Weighted average exercise price, Expired     153.60
Weigted average exercise price, Outstanding     $ 22.10 $ 22.10
Liability-Classified Warrants [Member]        
Class of Warrant or Right [Line Items]        
Number of warrants, Outstanding     515,984 555,667
Number of warrants, issued    
Number of warrants, Exercised    
Number of warrants, Expired     (39,683)
Number of warrants, Outstanding     515,984 515,984
Equity-Classified Warrants [Member]        
Class of Warrant or Right [Line Items]        
Number of warrants, Outstanding     1,405,505 509,619
Number of warrants, issued     895,886
Number of warrants, Exercised    
Number of warrants, Expired    
Number of warrants, Outstanding     1,405,505 1,405,505