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Marketable Securities and Fair Value Measurements - Assets and Liabilities Measured at Fair Value (Details) - Fair Value, Measurements, Recurring - USD ($) | Sep. 30, 2018 | Dec. 31, 2017
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Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | $ 80,576,359 | $ 124,876,806
Liabilities, fair value |  | 360,795
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 | 14,479,792 | 21,237,962
Liabilities, fair value |  | 0
Using Significant Other Unobservable Inputs (Level 2) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 66,096,567 | 103,638,844
Liabilities, fair value |  | 0
Using Significant Unobservable Inputs (Level 3) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 0 | 0
Liabilities, fair value |  | 360,795
Money market funds |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 1,780,138 | 9,843,482
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 | 1,780,138 | 9,843,482
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 | 64,874,989 | 68,565,889
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 | 64,874,989 | 68,565,889
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 | 1,221,578 | 35,072,955
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 | 1,221,578 | 35,072,955
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 | 12,699,654 | 11,394,480
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 | 12,699,654 | 11,394,480
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
Common stock warrants |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Liabilities, fair value |  | 360,795
Common stock warrants | Using Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Liabilities, fair value |  | 0
Common stock warrants | Using Significant Other Unobservable Inputs (Level 2) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Liabilities, fair value |  | 0
Common stock warrants | Using Significant Unobservable Inputs (Level 3) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Liabilities, fair value |  | $ 360,795

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