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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

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+ References

No definition available.

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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

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