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Notes Payable - Related Party (Narrative) (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Mar. 03, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Short-term Debt [Line Items] |  |  |  |  |  |
Interest expense |  | $ 104,000 | $ 24,000 | $ 220,000 | $ 66,000 |
Interest payable |  | $ 0 |  | $ 0 |  | $ 10,000
4% due November 30, 2021 [Member] |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Interest rate on loan renegotiated percentage | 4.00% |  |  |  |  |
Interest rate on loan original percentage | 2.75% |  |  |  |  |

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