Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
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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)
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-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
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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.

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Fair Value - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Asset included in:
Investments available-for-sale at fair value	$ 22,681,049	$ 0
U.S. Government Obligations
Asset included in:
Investments available-for-sale at fair value	6,031,515
Corporate Debt Securities
Asset included in:
Investments available-for-sale at fair value	16,649,534
Fair Value, Measurements, Recurring
Asset included in:
Financial Assets	30,602,704	8,521,054
Fair Value, Measurements, Recurring \| Money Market Securities
Asset included in:
Cash and cash equivalents	7,921,655	8,521,054
Fair Value, Measurements, Recurring \| U.S. Government Obligations
Asset included in:
Investments available-for-sale at fair value	6,031,515
Fair Value, Measurements, Recurring \| Corporate Debt Securities
Asset included in:
Investments available-for-sale at fair value	16,649,534
Fair Value, Measurements, Recurring \| Level 1
Asset included in:
Financial Assets	12,954,770	8,521,054
Fair Value, Measurements, Recurring \| Level 1 \| Money Market Securities
Asset included in:
Cash and cash equivalents	6,923,255	$ 8,521,054
Fair Value, Measurements, Recurring \| Level 1 \| U.S. Government Obligations
Asset included in:
Investments available-for-sale at fair value	6,031,515
Fair Value, Measurements, Recurring \| Level 2
Asset included in:
Financial Assets	17,647,934
Fair Value, Measurements, Recurring \| Level 2 \| Money Market Securities
Asset included in:
Cash and cash equivalents	998,400
Fair Value, Measurements, Recurring \| Level 2 \| Corporate Debt Securities
Asset included in:
Investments available-for-sale at fair value	$ 16,649,534