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Notes Payable - Related Party (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Notes Payable [Abstract] |  |  |  |  |
Interest expense | $ 52,000 | $ 74,000 | $ 156,000 | $ 220,000 |
Interest payable | $ 0 |  | $ 0 |  | $ 0

X
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