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Marketable Securities and Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	$ 86,415,823	$ 115,759,800
Liabilities, fair value	1,051,137	1,167,614
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	19,660,622	30,130,388
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	66,755,201	85,629,412
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	0
Liabilities, fair value	1,051,137	1,167,614
Money market funds [Member]
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	2,189,825	10,300,813
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	2,189,825	10,300,813
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	41,634,277	60,589,746
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	41,634,277	60,589,746
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	25,120,924	25,039,666
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	25,120,924	25,039,666
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
Investment in affiliated entity [Member]
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	17,470,797	19,829,575
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	17,470,797	19,829,575
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
Liabilities, fair value	1,051,137	1,167,614
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
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
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
Liabilities, fair value	$ 1,051,137	$ 1,167,614

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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