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Carrying Amounts and Fair Values of Company's Financial Instruments (Detail) - USD ($) | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Assets |  |  |
Assets, Fair Value Disclosure |  | $ 89,366,906 | $ 42,374,500
Fair Value, Inputs, Level 1 [Member] |  |  |
Assets |  |  |
Assets, Fair Value Disclosure |  | 89,366,906 | 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] | 87,479,604 | 41,231,405
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Assets |  |  |
Assets, Fair Value Disclosure | [1] | 87,479,604 | 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
Marketable securities – certificates of deposit [Member] |  |  |
Assets |  |  |
Assets, Fair Value Disclosure |  | 1,811,515 | 1,057,090
Marketable securities – certificates of deposit [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Assets |  |  |
Assets, Fair Value Disclosure |  | 1,811,515 | 1,057,090
Marketable securities – certificates of deposit [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Assets |  |  |
Assets, Fair Value Disclosure |  | 0 | 0
Marketable securities – certificates of deposit [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Assets |  |  |
Assets, Fair Value Disclosure |  | 0 | 0
Marketable securities – equity securities [Member] |  |  |
Assets |  |  |
Assets, Fair Value Disclosure |  | 75,787 | 86,005
Marketable securities – equity securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Assets |  |  |
Assets, Fair Value Disclosure |  | 75,787 | 86,005
Marketable securities – equity securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Assets |  |  |
Assets, Fair Value Disclosure |  | 0 | 0
Marketable securities – equity securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Assets |  |  |
Assets, Fair Value Disclosure |  | $ 0 | $ 0
[1] | Included in cash and cash equivalents

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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://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 + Details
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