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Marketable Securities (Details) - USD ($) | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Marketable securities | $ 9,667,073 | $ 8,290,679
U.S. Treasury notes and bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable securities | 5,088,386 | 5,034,955
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable securities | 0 | 2,504,551
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable securities | 2,256,191 | 0
Short-term cash investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable securities | 2,322,496 | 751,173
Level 1 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable securities | 5,088,386 | 5,034,955
Level 1 | U.S. Treasury notes and bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable securities | 5,088,386 | 5,034,955
Level 1 | Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable securities | 0 | 0
Level 1 | Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable securities |  | 0
Level 1 | Short-term cash investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable securities | 0 | 0
Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable securities | 4,578,687 | 3,255,724
Level 2 | U.S. Treasury notes and bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable securities | 0 | 0
Level 2 | Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable securities | 0 | 2,504,551
Level 2 | Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable securities | 2,256,191 | 0
Level 2 | Short-term cash investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Marketable securities | $ 2,322,496 | $ 751,173

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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