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Short-term Investments - Summary of Available-for-sale Securities (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Abstract]
Cost	$ 117,791,722
Gross unrealized gains	46,960
Gross unrealized losses	(6,287,792)
Fair market value	111,550,890
Mutual funds
Debt Securities, Available-for-sale [Abstract]
Cost	109,616,722	$ 66,599,219
Gross unrealized gains	5,000	754,709
Gross unrealized losses	(5,055,092)	(15,911)
Fair market value	104,566,630	$ 67,338,017
Corporate securities
Debt Securities, Available-for-sale [Abstract]
Cost	5,175,000
Gross unrealized gains	0
Gross unrealized losses	(1,202,700)
Fair market value	$ 3,972,300
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Contractual maturity (less than)	1 year
Debt Securities, Available-for-sale [Abstract]
Cost	$ 3,000,000
Gross unrealized gains	41,960
Gross unrealized losses	(30,000)
Fair market value	$ 3,011,960

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Debt Securities, Available-for-sale contractual maturity.

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