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Marketable Securities and Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) | Jun. 30, 2015 | Dec. 31, 2014
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Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | $ 169,792,728 | $ 102,440,851
Liabilities, fair value | 1,710,229 | 2,022,729
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 | 85,310,407 | 48,814,877
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 | 84,295,821 | 53,075,974
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 | 186,500 | 550,000
Liabilities, fair value | 1,710,229 | 2,022,729
Money market funds [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 66,460,760 | 36,474,066
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 | 66,460,760 | 36,474,066
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 | 58,235,791 | 29,273,635
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 | 58,235,791 | 29,273,635
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 | 25,955,991 | 23,802,339
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 | 25,955,991 | 23,802,339
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
Municipal Bonds [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 104,039 |
Municipal Bonds [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 |
Municipal Bonds [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 | 104,039 |
Municipal Bonds [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 |
Investment in affiliated entity [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 18,849,647 | 12,340,811
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 | 18,849,647 | 12,340,811
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 |  |
Assets, fair value | 186,500 | 550,000
Liabilities, fair value | 1,710,229 | 2,022,729
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 |  |
Assets, fair value | 0 | 0
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 |  |
Assets, fair value | 0 | 0
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 |  |
Assets, fair value | 186,500 | 550,000
Liabilities, fair value | $ 1,710,229 | $ 2,022,729

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