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Basis of Presentation - Carrying Amounts and Fair Values of Financial Instruments (Details) - USD ($) | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Assets |  |
Money market funds | $ 28,534,501 | $ 85,500,745
Marketable securities – certificates of deposit | 1,074,280 | 1,066,103
Marketable securities – equity securities | 75,548 | 60,999
Total | 29,684,329 | 86,627,847
Level 1 |  |
Assets |  |
Money market funds | 28,534,501 | 85,500,745
Marketable securities – certificates of deposit | 1,074,280 | 1,066,103
Marketable securities – equity securities | 75,548 | 60,999
Total | 29,684,329 | 86,627,847
Level 2 |  |
Assets |  |
Money market funds | 0 | 0
Marketable securities – certificates of deposit | 0 | 0
Marketable securities – equity securities | 0 | 0
Total | 0 | 0
Level 3 |  |
Assets |  |
Money market funds | 0 | 0
Marketable securities – certificates of deposit | 0 | 0
Marketable securities – equity securities | 0 | 0
Total | $ 0 | $ 0

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740 + Details
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