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Financial Condition (Details Narrative) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Cumulated net losses   $ (290,516,780) $ (273,665,247)
Cash, investment securities and interest receivable   16,700,000  
Raised in equity financing   6,400,000  
Proceeds from available future sale of equity under common stock purchase agreement   15,000,000  
Subsequent Event [Member]      
Net proceeds from sale of net operating losses $ 1,800,000    
New Jersey [Member]      
Tax benefits of EDA   1,900,000 10,400,000
Net proceeds from sale of net operating losses   1,800,000 $ 11,100,000
Future tax benefits   $ 2,100,000