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Marketable Securities and Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)	Jun. 30, 2016	Dec. 31, 2015
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	$ 156,049,697	$ 179,825,048
Liabilities, fair value	1,815,343	1,301,138
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	49,966,708	74,461,801
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	106,082,989	105,357,277
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	5,970
Liabilities, fair value	1,815,343	1,301,138
Money market funds [Member]
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	22,940,492	54,474,609
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	22,940,492	54,474,609
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	78,498,696	78,385,992
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	78,498,696	78,385,992
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	27,584,293	26,869,403
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	27,584,293	26,869,403
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		101,882
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		101,882
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	27,026,216	19,987,192
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	27,026,216	19,987,192
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		5,970
Liabilities, fair value	1,815,343	1,301,138
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
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
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		5,970
Liabilities, fair value	$ 1,815,343	$ 1,301,138

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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)
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- Definition

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+ References

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-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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