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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 |

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