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Investments - Summary of Available-for-sale Securities (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Abstract]
Cost	$ 106,708,394	$ 58,067,588
Gross Unrealized Gains	539,546	0
Gross Unrealized Losses	(31,442)	(528,736)
Fair Market Value	107,216,498	57,538,852
Mutual funds
Debt Securities, Available-for-sale [Abstract]
Cost	106,483,816	57,842,955
Gross Unrealized Gains	539,170	0
Gross Unrealized Losses	(31,229)	(528,084)
Fair Market Value	106,991,757	57,314,871
US corporate debt securities
Debt Securities, Available-for-sale [Abstract]
Cost	224,578	224,633
Gross Unrealized Gains	376	0
Gross Unrealized Losses	(213)	(652)
Fair Market Value	$ 224,741	$ 223,981
Maximum | US corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Contractual maturity, less than	2 years	2 years

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Debt Securities, Available-for-sale contractual maturity.

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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-Publisher FASB
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-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
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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).

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