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Fair Value Measurements (Details) - Fair Value, Measurements, Recurring - USD ($) | Dec. 31, 2015 | Dec. 31, 2014
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Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | $ 179,825,048 | $ 102,440,851
Liabilities, fair value | 1,301,138 | 2,022,729
Quoted Prices in Active Markets (Level 1) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 74,461,801 | 48,814,877
Liabilities, fair value | 0 | 0
Significant Other Unobservable Inputs (Level 2) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 105,357,277 | 53,075,974
Liabilities, fair value | 0 | 0
Significant Unobservable Inputs (Level 3) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 5,970 | 550,000
Liabilities, fair value | 1,301,138 | 2,022,729
Money market funds |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 54,474,609 | 36,474,066
Money market funds | Quoted Prices in Active Markets (Level 1) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 54,474,609 | $ 36,474,066
Money market funds | Significant Other Unobservable Inputs (Level 2) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 0 |
Money market funds | 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 | 78,385,992 | 29,273,635
Mutual funds | Quoted Prices in Active Markets (Level 1) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 0 | 0
Mutual funds | Significant Other Unobservable Inputs (Level 2) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 78,385,992 | 29,273,635
Mutual funds | 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 | 26,869,403 | 23,802,339
US corporate debt securities | Quoted Prices in Active Markets (Level 1) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 0 | 0
US corporate debt securities | Significant Other Unobservable Inputs (Level 2) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 26,869,403 | 23,802,339
US corporate debt securities | Significant Unobservable Inputs (Level 3) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 0 | 0
Municipal bonds |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 101,882 |
Municipal bonds | Quoted Prices in Active Markets (Level 1) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 0 |
Municipal bonds | Significant Other Unobservable Inputs (Level 2) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 101,882 |
Municipal bonds | Significant Unobservable Inputs (Level 3) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 0 |
Investments in affiliated entities |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 19,987,192 | 12,340,811
Investments in affiliated entities | Quoted Prices in Active Markets (Level 1) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 19,987,192 | 12,340,811
Investments in affiliated entities | Significant Other Unobservable Inputs (Level 2) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 0 | 0
Investments in affiliated entities | 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 |  |
Assets, fair value | 5,970 | 550,000
Liabilities, fair value | 1,301,138 | 2,022,729
Common stock warrants | Quoted Prices in Active Markets (Level 1) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 0 | 0
Liabilities, fair value | 0 | 0
Common stock warrants | Significant Other Unobservable Inputs (Level 2) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 0 | 0
Liabilities, fair value | 0 | 0
Common stock warrants | Significant Unobservable Inputs (Level 3) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 5,970 | 550,000
Liabilities, fair value | $ 1,301,138 | $ 2,022,729

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