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Fair Value Measurements (Details) - Fair Value, Measurements, Recurring - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	$ 115,759,800	$ 179,825,048
Liabilities, fair value	1,167,614	1,301,138
Quoted Prices in Active Markets (Level 1)
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	30,130,388	74,461,801
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	85,629,412	105,357,277
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	0	5,970
Liabilities, fair value	1,167,614	1,301,138
Money market funds
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	10,300,813	54,474,609
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	10,300,813	54,474,609
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	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	60,589,746	78,385,992
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	60,589,746	78,385,992
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	25,039,666	26,869,403
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	25,039,666	26,869,403
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	19,829,575	19,987,192
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	19,829,575	19,987,192
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
Liabilities, fair value	1,167,614	1,301,138
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
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
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
Liabilities, fair value	$ 1,167,614	$ 1,301,138

X

- 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=66048111&loc=d3e19207-110258

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- Definition

Fair value of financial and nonfinancial obligations.

+ References

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