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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, 2019	Dec. 31, 2018
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	$ 123,477,715	$ 76,591,272
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	16,261,217	19,052,420
Using Significant Other Unobservable Inputs (Level 2)
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	107,216,498	57,538,852
Using Significant Unobservable Inputs (Level 3)
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	0	0
Money market funds
Financial assets and liabilities that are measured at fair value on recurring basis
Assets, fair value	7,605,407	9,646,507
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	7,605,407	9,646,507
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	106,991,757	57,314,871
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	106,991,757	57,314,871
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	224,741	223,981
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	224,741	223,981
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	8,655,810	9,405,913
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	8,655,810	9,405,913
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

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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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- References

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