Registration of securities issued in business combination transactions

Warrants (Summary Of Warrants Outstanding) (Details)

v3.20.2
Warrants (Summary Of Warrants Outstanding) (Details) - $ / shares
 6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Jan. 25, 2019
Dec. 31, 2018
Oct. 19, 2018
Class of Warrant or Right [Line Items]          
Number of Warrants 1,921,489 1,921,489   1,065,286  
Exercise Price     $ 9.60   $ 20.04
Liability-Classified Warrants [Member]          
Class of Warrant or Right [Line Items]          
Number of Warrants 515,984 515,984   555,667  
Equity-Classified Warrants [Member]          
Class of Warrant or Right [Line Items]          
Number of Warrants 1,405,505 1,405,505   509,619  
January 2014 Investor Warrants [Member] | Liability-Classified Warrants [Member]          
Class of Warrant or Right [Line Items]          
Number of Warrants       39,683  
Exercise Price   $ 153.60      
Expiration Date   2019-01      
November 2015 Investor Warrants [Member] | Liability-Classified Warrants [Member]          
Class of Warrant or Right [Line Items]          
Number of Warrants 104,168 104,168   104,168  
Exercise Price $ 63.60 $ 63.60      
Expiration Date 2021-05 2021-05      
November 2015 Placement Agent Warrants [Member] | Liability-Classified Warrants [Member]          
Class of Warrant or Right [Line Items]          
Number of Warrants 279 279   279  
Exercise Price $ 63.60 $ 63.60      
Expiration Date 2020-11 2020-11      
March 2016 Investor Warrants [Member] | Liability-Classified Warrants [Member]          
Class of Warrant or Right [Line Items]          
Number of Warrants 50,651 50,651   50,651  
Exercise Price $ 50.40 $ 50.40      
Expiration Date 2021-09 2021-09      
September 2016 Investor Warrants [Member] | Liability-Classified Warrants [Member]          
Class of Warrant or Right [Line Items]          
Number of Warrants 67,084 67,084   67,084  
Exercise Price $ 36.00 $ 36.00      
Expiration Date 2022-03 2022-03      
June 2017 Investor Warrants [Member] | Liability-Classified Warrants [Member]          
Class of Warrant or Right [Line Items]          
Number of Warrants 126,264 126,264   126,264  
Exercise Price $ 48.00 $ 48.00      
Expiration Date 2022-12 2022-12      
June 2017 Placement Agent Warrants [Member] | Liability-Classified Warrants [Member]          
Class of Warrant or Right [Line Items]          
Number of Warrants 15,153 15,153   15,153  
Exercise Price $ 49.50 $ 49.50      
Expiration Date 2022-06 2022-06      
October 2017 Investor Warrants [Member] | Liability-Classified Warrants [Member]          
Class of Warrant or Right [Line Items]          
Number of Warrants 136,058 136,058   136,058  
Exercise Price $ 34.20 $ 34.20      
Expiration Date 2023-04 2023-04      
October 2017 Placement Agent Warrants [Member] | Liability-Classified Warrants [Member]          
Class of Warrant or Right [Line Items]          
Number of Warrants 16,327 16,327   16,327  
Exercise Price $ 36.72 $ 36.72      
Expiration Date 2022-10 2022-10      
October 2018 Investor Warrants [Member] | Equity-Classified Warrants [Member]          
Class of Warrant or Right [Line Items]          
Number of Warrants 480,771 480,771   480,771  
Exercise Price $ 20.04 $ 20.04      
Expiration Date 2024-04 2024-04      
October 2018 Placement Agent Warrants [Member] | Equity-Classified Warrants [Member]          
Class of Warrant or Right [Line Items]          
Number of Warrants 28,848 28,848   28,848  
Exercise Price $ 19.50 $ 19.50      
Expiration Date 2023-10 2023-10      
January 2019 Investor Warrants [Member] | Equity-Classified Warrants [Member]          
Class of Warrant or Right [Line Items]          
Number of Warrants 895,886 895,886      
Exercise Price $ 9.60 $ 9.60      
Expiration Date 2024-01 2024-01