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Marketable Securities and Fair Value Measurements (Details) (Fair Value, Measurements, Recurring [Member], USD $) | Mar. 31, 2014 | Dec. 31, 2013
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Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | $ 115,513,744 | $ 56,140,255
Liabilities, fair value | 6,045,903 | 19,540,583
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 | 96,092,252 | 36,517,147
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 | 18,011,492 | 18,905,608
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 | 1,410,000 | 717,500
Liabilities, fair value | 6,045,903 | 19,540,583
Money market funds [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 86,804,628 | 26,852,560
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 | 86,804,628 | 26,852,560
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 | 17,206,520 | 18,099,904
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 | 17,206,520 | 18,099,904
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
Municipal bonds [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 804,972 | 805,704
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 | 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 | 804,972 | 805,704
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 | 0
Investment in affiliated entity [Member] |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Assets, fair value | 9,287,624 | 9,664,587
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 | 9,287,624 | 9,664,587
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 | 1,410,000 | 717,500
Liabilities, fair value | 6,045,903 | 19,540,583
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 | 1,410,000 | 717,500
Liabilities, fair value | $ 6,045,903 | $ 19,540,583

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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