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Investments - Summary of Available-for-sale Securities (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2015
Debt Securities, Available-for-sale [Line Items]
Cost	$ 58,067,588
Gross Unrealized Gains	0
Gross Unrealized Losses	(528,736)
Fair Market Value	57,538,852
Cost			$ 0
Cost		$ 103,986,286
Gross Unrealized Gains		2,370,208
Gross Unrealized Losses		(392,571)
Fair Market Value		105,963,923
Mutual funds
Debt Securities, Available-for-sale [Line Items]
Cost	57,842,955	68,776,165
Gross Unrealized Gains	0	42,097
Gross Unrealized Losses	(528,084)	(252,373)
Fair Market Value	57,314,871	68,565,889
US corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Cost	224,633	35,210,121
Gross Unrealized Gains	0	3,032
Gross Unrealized Losses	(652)	(140,198)
Fair Market Value	$ 223,981	35,072,955
Common stock
Debt Securities, Available-for-sale [Line Items]
Cost		0
Gross Unrealized Gains		2,325,079
Gross Unrealized Losses		0
Fair Market Value		$ 2,325,079
Maximum | US corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Contractual maturity	2 years	2 years

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