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Carrying Amounts and Fair Values of Company's Financial Instruments (Detail) - USD ($)		Jun. 30, 2018	Dec. 31, 2017
Assets
Assets, Fair Value Disclosure		$ 76,476,041	$ 42,374,500
Fair Value, Inputs, Level 1 [Member]
Assets
Assets, Fair Value Disclosure		76,476,041	42,374,500
Fair Value, Inputs, Level 2 [Member]
Assets
Assets, Fair Value Disclosure		0	0
Fair Value, Inputs, Level 3 [Member]
Assets
Assets, Fair Value Disclosure		0	0
Money Market Funds [Member]
Assets
Assets, Fair Value Disclosure	[1]	75,345,074	41,231,405
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Assets
Assets, Fair Value Disclosure	[1]	75,345,074	41,231,405
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Assets
Assets, Fair Value Disclosure	[1]	0	0
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Assets
Assets, Fair Value Disclosure	[1]	0	0
Certificates of Deposit [Member]
Assets
Assets, Fair Value Disclosure		1,061,022	1,057,090
Certificates of Deposit [Member] | Fair Value, Inputs, Level 1 [Member]
Assets
Assets, Fair Value Disclosure		1,061,022	1,057,090
Certificates of Deposit [Member] | Fair Value, Inputs, Level 2 [Member]
Assets
Assets, Fair Value Disclosure		0	0
Certificates of Deposit [Member] | Fair Value, Inputs, Level 3 [Member]
Assets
Assets, Fair Value Disclosure		0	0
Equity Securities [Member]
Assets
Assets, Fair Value Disclosure		69,945	86,005
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Assets
Assets, Fair Value Disclosure		69,945	86,005
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Assets
Assets, Fair Value Disclosure		0	0
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Assets
Assets, Fair Value Disclosure		$ 0	$ 0
[1] Included in cash and cash equivalents

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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