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Investments - Summary of Available-for-sale Securities (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Jun. 30, 2019
Debt Securities, Available-for-sale [Abstract]
Cost	$ 58,067,588
Gross Unrealized Gains	0
Gross Unrealized Losses	(528,736)
Fair Market Value	57,538,852
Mutual funds
Debt Securities, Available-for-sale [Abstract]
Cost	57,842,955	$ 85,168,756
Gross Unrealized Gains	0	1,067,059
Gross Unrealized Losses	(528,084)	0
Fair Market Value	57,314,871	$ 86,235,815
US corporate debt securities
Debt Securities, Available-for-sale [Abstract]
Cost	224,633
Gross Unrealized Gains	0
Gross Unrealized Losses	(652)
Fair Market Value	$ 223,981
Maximum | US corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Contractual maturity, less than	2 years

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