Registration of securities issued in business combination transactions

Stock-Based Compensation (Summary Of Share-Based Transactions ) (Details)

v3.20.2
Stock-Based Compensation (Summary Of Share-Based Transactions ) (Details) - Stock Option [Member] - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Number of Options, Oustanding 204,574 255,922  
Number of Options, Granted 52,465  
Number of Options, Exercised    
Number of Options, Expired (2,498) (2,080)  
Number of Options, Cancelled (53,054) (101,733)  
Number of Options, Oustanding 149,022 204,574 255,922
Weighted Average Exercise Price, Outstanding $ 35.60 $ 41.88  
Weighted Average Exercise Price, Granted 6.41  
Weighted Average Exercise Price, Exercised    
Weighted Average Exercise Price, Expired 159.60 97.78  
Weighted Average Exercise Price, Cancelled 60.40 34.99  
Weighted Average Exercise Price, Outstanding $ 24.69 $ 35.60 $ 41.88
Weighted Average Remaining Contractual Term, Outstanding 7 years 9 months 18 days 7 years 3 months 18 days 7 years 9 months 18 days
Aggregate Intrinsic Value, Outstanding  
Number of Options, Exercisable 75,304 123,263  
Weighted Average Exercise Price, Exercisable $ 37.16 $ 51.15  
Weighted Average Remaining Contractual Term, Exercisable 7 years 6 years 2 months 12 days  
Aggregate Intrinsic Value, Exercisable