Registration of securities issued in business combination transactions

Warrants (Schedule Of Unrealized Gain/(Loss) On Fair Value Of Warrants) (Details)

v3.20.2
Warrants (Schedule Of Unrealized Gain/(Loss) On Fair Value Of Warrants) (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Class of Warrant or Right [Line Items]            
Unrealized (loss) gain on fair value of warrants $ (168,702) $ 427,483 $ (227,094) $ 1,940,854 $ 2,265,869 $ 5,546,049
Expired Warrants [Member]            
Class of Warrant or Right [Line Items]            
Unrealized (loss) gain on fair value of warrants           64,307
November 2015 Investor Warrants [Member]            
Class of Warrant or Right [Line Items]            
Unrealized (loss) gain on fair value of warrants (2,315) 27,069 (3,231) 224,153 234,863 1,025,132
November 2015 Placement Agent Warrants [Member]            
Class of Warrant or Right [Line Items]            
Unrealized (loss) gain on fair value of warrants   55   435 435 2,501
March 2016 Investor Warrants [Member]            
Class of Warrant or Right [Line Items]            
Unrealized (loss) gain on fair value of warrants (5,122) 32,874 (5,923) 147,673 159,660 537,455
September 2016 Investor Warrants [Member]            
Class of Warrant or Right [Line Items]            
Unrealized (loss) gain on fair value of warrants (14,126) 72,213 (25,569) 290,082 330,638 720,249
June 2017 Investor Warrants [Member]            
Class of Warrant or Right [Line Items]            
Unrealized (loss) gain on fair value of warrants (53,099) 129,559 (71,727) 517,950 611,588 1,358,540
June 2017 Placement Agent Warrants [Member]            
Class of Warrant or Right [Line Items]            
Unrealized (loss) gain on fair value of warrants (3,774) 14,553 (5,503) 56,464 64,304 156,442
October 2017 Investor Warrants [Member]            
Class of Warrant or Right [Line Items]            
Unrealized (loss) gain on fair value of warrants (83,121) 135,125 (105,527) 631,626 777,779 1,504,001
October 2017 Placement Agent Warrants [Member]            
Class of Warrant or Right [Line Items]            
Unrealized (loss) gain on fair value of warrants $ (7,145) $ 16,035 $ (9,614) $ 72,471 $ 86,602 $ 177,422