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Short-term Investments and Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) | Mar. 31, 2022 | Dec. 31, 2021
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Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | $ 301,384,357 | $ 330,170,940
Mutual funds |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | 172,280,734 | 191,439,430
Commercial paper |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | 39,986,103 | 39,967,853
Certificates of deposit |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | 2,991,347 | 2,991,490
U.S. agency mortgage-backed securities |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | 1,461,623 | 1,588,647
Fair Value, Measurements, Recurring |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | 301,384,357 | 330,170,940
Investment in affiliated entity | 3,369,068 | 3,906,796
Total assets measured at fair value | 304,753,425 | 334,077,736
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | 256,945,284 | 285,622,950
Investment in affiliated entity | 3,369,068 | 3,906,796
Total assets measured at fair value | 260,314,352 | 289,529,746
Fair Value, Measurements, Recurring | Significant Other Unobservable Inputs (Level 2) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | 44,439,073 | 44,547,990
Investment in affiliated entity | 0 | 0
Total assets measured at fair value | 44,439,073 | 44,547,990
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | 0 | 0
Investment in affiliated entity | 0 | 0
Total assets measured at fair value | 0 | 0
Fair Value, Measurements, Recurring | Mutual funds |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | 172,280,734 | 191,439,430
Fair Value, Measurements, Recurring | Mutual funds | Quoted Prices in Active Markets (Level 1) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | 172,280,734 | 191,439,430
Fair Value, Measurements, Recurring | Mutual funds | Significant Other Unobservable Inputs (Level 2) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | 0 | 0
Fair Value, Measurements, Recurring | Mutual funds | Significant Unobservable Inputs (Level 3) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | 0 | 0
Fair Value, Measurements, Recurring | U.S. treasury securities |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | 84,664,550 | 94,183,520
Fair Value, Measurements, Recurring | U.S. treasury securities | Quoted Prices in Active Markets (Level 1) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | 84,664,550 | 94,183,520
Fair Value, Measurements, Recurring | U.S. treasury securities | Significant Other Unobservable Inputs (Level 2) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | 0 | 0
Fair Value, Measurements, Recurring | U.S. treasury securities | Significant Unobservable Inputs (Level 3) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | 0 | 0
Fair Value, Measurements, Recurring | Commercial paper |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | 39,986,103 | 39,967,853
Fair Value, Measurements, Recurring | Commercial paper | Quoted Prices in Active Markets (Level 1) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | 0 | 0
Fair Value, Measurements, Recurring | Commercial paper | Significant Other Unobservable Inputs (Level 2) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | 39,986,103 | 39,967,853
Fair Value, Measurements, Recurring | Commercial paper | Significant Unobservable Inputs (Level 3) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | 0 | 0
Fair Value, Measurements, Recurring | Certificates of deposit |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | 2,991,347 | 2,991,490
Fair Value, Measurements, Recurring | Certificates of deposit | Quoted Prices in Active Markets (Level 1) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | 0 | 0
Fair Value, Measurements, Recurring | Certificates of deposit | Significant Other Unobservable Inputs (Level 2) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | 2,991,347 | 2,991,490
Fair Value, Measurements, Recurring | Certificates of deposit | Significant Unobservable Inputs (Level 3) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | 0 | 0
Fair Value, Measurements, Recurring | U.S. agency mortgage-backed securities |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | 1,461,623 | 1,588,647
Fair Value, Measurements, Recurring | U.S. agency mortgage-backed securities | Quoted Prices in Active Markets (Level 1) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | 0 | 0
Fair Value, Measurements, Recurring | U.S. agency mortgage-backed securities | Significant Other Unobservable Inputs (Level 2) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | 1,461,623 | 1,588,647
Fair Value, Measurements, Recurring | U.S. agency mortgage-backed securities | Significant Unobservable Inputs (Level 3) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | $ 0 | $ 0

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