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Fair Value Measurements - Assets and Liabilities Measured at Fair Value (Details) - USD ($) | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Assets: |  |
Debt securities, available for sale | $ 158,535,744 |
Investment in affiliated entities | 4,154,049 | $ 6,315,356
Liabilities: |  |
Derivative liability (Note 9) | 0 | 8,819,023
Significant Unobservable Inputs (Level 3) |  |
Liabilities: |  |
Derivative liability (Note 9) | 7,100,000 |
Mutual funds |  |
Assets: |  |
Debt securities, available for sale | 152,802,199 | 67,338,017
Corporate debt securities |  |
Assets: |  |
Debt securities, available for sale | 1,172,160 |
Certificates of deposit |  |
Assets: |  |
Debt securities, available for sale | 3,032,980 |
U.S. agency mortgage-backed securities |  |
Assets: |  |
Debt securities, available for sale | 1,528,405 |
Fair Value, Measurements, Recurring |  |
Assets: |  |
Debt securities, available for sale | 158,535,744 |
Investment in affiliated entities | 4,154,049 | 6,315,356
Total assets measured at fair value | 262,674,793 | 76,003,102
Liabilities: |  |
Derivative liability (Note 9) |  | 8,819,023
Total liabilities |  | 8,819,023
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) |  |
Assets: |  |
Debt securities, available for sale | 153,974,359 |
Investment in affiliated entities | 4,154,049 | 6,315,356
Total assets measured at fair value | 258,113,408 | 76,003,102
Liabilities: |  |
Derivative liability (Note 9) |  | 0
Total liabilities |  | 0
Fair Value, Measurements, Recurring | Significant Other Unobservable Inputs (Level 2) |  |
Assets: |  |
Debt securities, available for sale | 4,561,385 |
Investment in affiliated entities | 0 | 0
Total assets measured at fair value | 4,561,385 | 0
Liabilities: |  |
Derivative liability (Note 9) |  | 0
Total liabilities |  | 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Debt securities, available for sale | 0 |
Investment in affiliated entities | 0 | 0
Total assets measured at fair value | 0 | 0
Liabilities: |  |
Derivative liability (Note 9) |  | 8,819,023
Total liabilities |  | 8,819,023
Fair Value, Measurements, Recurring | U.S. treasury securities |  |
Assets: |  |
Cash and cash equivalents, fair value | 99,985,000 |
Fair Value, Measurements, Recurring | U.S. treasury securities | Quoted Prices in Active Markets (Level 1) |  |
Assets: |  |
Cash and cash equivalents, fair value | 99,985,000 |
Fair Value, Measurements, Recurring | U.S. treasury securities | Significant Other Unobservable Inputs (Level 2) |  |
Assets: |  |
Cash and cash equivalents, fair value | 0 |
Fair Value, Measurements, Recurring | U.S. treasury securities | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Cash and cash equivalents, fair value | 0 |
Fair Value, Measurements, Recurring | Mutual funds |  |
Assets: |  |
Debt securities, available for sale | 152,802,199 | 67,338,017
Fair Value, Measurements, Recurring | Mutual funds | Quoted Prices in Active Markets (Level 1) |  |
Assets: |  |
Debt securities, available for sale | 152,802,199 | 67,338,017
Fair Value, Measurements, Recurring | Mutual funds | Significant Other Unobservable Inputs (Level 2) |  |
Assets: |  |
Debt securities, available for sale | 0 | 0
Fair Value, Measurements, Recurring | Mutual funds | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Debt securities, available for sale | 0 | 0
Fair Value, Measurements, Recurring | Corporate debt securities |  |
Assets: |  |
Debt securities, available for sale | 1,172,160 |
Fair Value, Measurements, Recurring | Corporate debt securities | Significant Other Unobservable Inputs (Level 2) |  |
Assets: |  |
Debt securities, available for sale | 0 |
Fair Value, Measurements, Recurring | Corporate debt securities | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Debt securities, available for sale | 0 |
Fair Value, Measurements, Recurring | Certificates of deposit |  |
Assets: |  |
Debt securities, available for sale | 3,032,980 |
Fair Value, Measurements, Recurring | Certificates of deposit | Quoted Prices in Active Markets (Level 1) |  |
Assets: |  |
Debt securities, available for sale | 0 |
Fair Value, Measurements, Recurring | Certificates of deposit | Significant Other Unobservable Inputs (Level 2) |  |
Assets: |  |
Debt securities, available for sale | 3,032,980 |
Fair Value, Measurements, Recurring | Certificates of deposit | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Debt securities, available for sale | 0 |
Fair Value, Measurements, Recurring | Money market funds |  |
Assets: |  |
Cash and cash equivalents, fair value |  | 2,349,729
Fair Value, Measurements, Recurring | Money market funds | Quoted Prices in Active Markets (Level 1) |  |
Assets: |  |
Cash and cash equivalents, fair value |  | 2,349,729
Fair Value, Measurements, Recurring | Money market funds | Significant Other Unobservable Inputs (Level 2) |  |
Assets: |  |
Cash and cash equivalents, fair value |  | 0
Fair Value, Measurements, Recurring | Money market funds | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Cash and cash equivalents, fair value |  | $ 0
Fair Value, Measurements, Recurring | U.S. agency mortgage-backed securities |  |
Assets: |  |
Debt securities, available for sale | 1,528,405 |
Fair Value, Measurements, Recurring | U.S. agency mortgage-backed securities | Quoted Prices in Active Markets (Level 1) |  |
Assets: |  |
Debt securities, available for sale | 0 |
Fair Value, Measurements, Recurring | U.S. agency mortgage-backed securities | Significant Other Unobservable Inputs (Level 2) |  |
Assets: |  |
Debt securities, available for sale | 1,528,405 |
Fair Value, Measurements, Recurring | U.S. agency mortgage-backed securities | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Debt securities, available for sale | $ 0 |

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