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Marketable Securities and Fair Value Measurements - Assets and Liabilities Measured at Fair Value (Details) - Fair Value, Measurements, Recurring - USD ($) | Mar. 31, 2019 | Dec. 31, 2018
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Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | $ 123,477,715 | $ 76,591,272
Using Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 16,261,217 | 19,052,420
Using Significant Other Unobservable Inputs (Level 2) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 107,216,498 | 57,538,852
Using Significant Unobservable Inputs (Level 3) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 0 | 0
Money market funds |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 7,605,407 | 9,646,507
Money market funds | Using Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 7,605,407 | 9,646,507
Money market funds | Using Significant Other Unobservable Inputs (Level 2) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 0 | 0
Money market funds | Using Significant Unobservable Inputs (Level 3) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 0 | 0
Mutual funds |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 106,991,757 | 57,314,871
Mutual funds | Using Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 0 | 0
Mutual funds | Using Significant Other Unobservable Inputs (Level 2) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 106,991,757 | 57,314,871
Mutual funds | Using Significant Unobservable Inputs (Level 3) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 0 | 0
US corporate debt securities |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 224,741 | 223,981
US corporate debt securities | Using Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 0 | 0
US corporate debt securities | Using Significant Other Unobservable Inputs (Level 2) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 224,741 | 223,981
US corporate debt securities | Using Significant Unobservable Inputs (Level 3) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 0 | 0
Investment in affiliated entity |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 8,655,810 | 9,405,913
Investment in affiliated entity | Using Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 8,655,810 | 9,405,913
Investment in affiliated entity | Using Significant Other Unobservable Inputs (Level 2) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 0 | 0
Investment in affiliated entity | Using Significant Unobservable Inputs (Level 3) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | $ 0 | $ 0

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