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Marketable Securities and Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) | Mar. 31, 2017 | Dec. 31, 2016
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Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | $ 86,415,823 | $ 115,759,800
Liabilities, fair value | 1,051,137 | 1,167,614
Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 19,660,622 | 30,130,388
Liabilities, fair value | 0 | 0
Using Significant Other Unobservable Inputs (Level 2) [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 66,755,201 | 85,629,412
Liabilities, fair value | 0 | 0
Using Significant Unobservable Inputs (Level 3) [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 0 | 0
Liabilities, fair value | 1,051,137 | 1,167,614
Money market funds [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 2,189,825 | 10,300,813
Money market funds [Member] | Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 2,189,825 | 10,300,813
Money market funds [Member] | Using Significant Other Unobservable Inputs (Level 2) [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 0 | 0
Money market funds [Member] | Using Significant Unobservable Inputs (Level 3) [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 0 | 0
Mutual funds [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 41,634,277 | 60,589,746
Mutual funds [Member] | Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 0 | 0
Mutual funds [Member] | Using Significant Other Unobservable Inputs (Level 2) [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 41,634,277 | 60,589,746
Mutual funds [Member] | Using Significant Unobservable Inputs (Level 3) [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 0 | 0
US corporate debt securities [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 25,120,924 | 25,039,666
US corporate debt securities [Member] | Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 0 | 0
US corporate debt securities [Member] | Using Significant Other Unobservable Inputs (Level 2) [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 25,120,924 | 25,039,666
US corporate debt securities [Member] | Using Significant Unobservable Inputs (Level 3) [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 0 | 0
Investment in affiliated entity [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 17,470,797 | 19,829,575
Investment in affiliated entity [Member] | Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 17,470,797 | 19,829,575
Investment in affiliated entity [Member] | Using Significant Other Unobservable Inputs (Level 2) [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 0 | 0
Investment in affiliated entity [Member] | Using Significant Unobservable Inputs (Level 3) [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 0 | 0
Common stock warrants [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Liabilities, fair value | 1,051,137 | 1,167,614
Common stock warrants [Member] | Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Liabilities, fair value | 0 | 0
Common stock warrants [Member] | Using Significant Other Unobservable Inputs (Level 2) [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Liabilities, fair value | 0 | 0
Common stock warrants [Member] | Using Significant Unobservable Inputs (Level 3) [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Liabilities, fair value | $ 1,051,137 | $ 1,167,614

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