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Stock Subscription Notes Receivable - Additional Information (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Stock Subscription Notes Receivable [Line Items] |  |  |
New stock subscription notes principal payments received | $ 34,000 | $ 100,000 |
Combined total of outstanding principal | $ 600,000 |  | $ 600,000
Promissory Note | Minimum |  |  |
Stock Subscription Notes Receivable [Line Items] |  |  |
Promissory note interest rate | 3.25% |  |
Promissory Note | Maximum |  |  |
Stock Subscription Notes Receivable [Line Items] |  |  |
Promissory note interest rate | 4.75% |  |

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