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Marketable Securities and Fair Value Measurements - Assets and Liabilities Measured at Fair Value (Details) - Fair Value, Measurements, Recurring - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	$ 90,625,399	$ 124,876,806
Liabilities, fair value	488,636	360,795
Using Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	15,365,510	21,237,962
Liabilities, fair value	0	0
Using Significant Other Unobservable Inputs (Level 2)
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	75,259,889	103,638,844
Liabilities, fair value	0	0
Using Significant Unobservable Inputs (Level 3)
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	0	0
Liabilities, fair value	488,636	360,795
Money market funds
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	1,590,607	9,843,482
Money market funds | Using Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	1,590,607	9,843,482
Money market funds | Using 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 | Using 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	54,203,448	68,565,889
Mutual funds | Using Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	0	0
Mutual funds | Using Significant Other Unobservable Inputs (Level 2)
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	54,203,448	68,565,889
Mutual funds | Using 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	21,056,441	35,072,955
US corporate debt securities | Using Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	0	0
US corporate debt securities | Using Significant Other Unobservable Inputs (Level 2)
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	21,056,441	35,072,955
US corporate debt securities | Using Significant Unobservable Inputs (Level 3)
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	0	0
Investment in affiliated entity
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	13,774,903	11,394,480
Investment in affiliated entity | Using Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	13,774,903	11,394,480
Investment in affiliated entity | Using Significant Other Unobservable Inputs (Level 2)
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	0	0
Investment in affiliated entity | Using 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
Liabilities, fair value	488,636	360,795
Common stock warrants | Using Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets and liabilities that are measured at fair value on recurring basis
Liabilities, fair value	0	0
Common stock warrants | Using Significant Other Unobservable Inputs (Level 2)
Financial assets and liabilities that are measured at fair value on recurring basis
Liabilities, fair value	0	0
Common stock warrants | Using Significant Unobservable Inputs (Level 3)
Financial assets and liabilities that are measured at fair value on recurring basis
Liabilities, fair value	$ 488,636	$ 360,795

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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=66048111&loc=d3e19207-110258

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- Definition

Fair value of financial and nonfinancial obligations.

+ References

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-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
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