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Short-term Investments - Summary of Available-for-sale Securities (Details) - USD ($)	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Abstract]
Cost	$ 157,266,400
Gross Unrealized Gains	1,232,945
Gross Unrealized Losses	(2,268,243)
Fair Market Value	156,231,102
Mutual funds
Debt Securities, Available-for-sale [Abstract]
Cost	149,641,400	$ 66,599,219
Gross Unrealized Gains	1,180,185	754,709
Gross Unrealized Losses	(1,871,643)	(15,911)
Fair Market Value	148,949,942	$ 67,338,017
Corporate debt securities
Debt Securities, Available-for-sale [Abstract]
Cost	4,625,000
Gross Unrealized Gains	14,400
Gross Unrealized Losses	(376,600)
Fair Market Value	$ 4,262,800
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	38,360
Gross Unrealized Losses	(20,000)
Fair Market Value	$ 3,018,360

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Debt Securities, Available-for-sale contractual maturity.

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