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Short-term Investments - Summary of Available-for-sale Securities (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Debt Securities, Available-for-sale [Abstract]
Cost	$ 434,134,291		$ 159,239,931
Gross Unrealized Gains	1,597,702		2,365,899
Gross Unrealized Losses	(762,465)		(690,895)
Fair Market Value	434,969,528		160,914,935
Mutual funds
Debt Securities, Available-for-sale [Abstract]
Cost	228,101,615		153,177,675
Gross Unrealized Gains	1,562,498		2,339,639
Gross Unrealized Losses	(714,957)		(644,140)
Fair Market Value	$ 228,949,156		154,873,174
U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Contractual maturity (less than)	1 year
Debt Securities, Available-for-sale [Abstract]
Cost	$ 200,408,976
Gross Unrealized Gains	14,404
Gross Unrealized Losses	(9,380)
Fair Market Value	$ 200,414,000
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Contractual maturity (less than)	1 year	1 year
Debt Securities, Available-for-sale [Abstract]
Cost	$ 2,977,623		3,000,000
Gross Unrealized Gains	19,700		26,260
Gross Unrealized Losses	(5,123)		(10,000)
Fair Market Value	2,992,200		3,016,260
U.S. agency mortgage-backed securities
Debt Securities, Available-for-sale [Abstract]
Cost	2,646,077		3,062,256
Gross Unrealized Gains	1,100		0
Gross Unrealized Losses	(33,005)		(36,755)
Fair Market Value	$ 2,614,172		$ 3,025,501

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Debt Securities, Available-for-sale contractual maturity.

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