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Short-term Investments - Summary of Available-for-sale Securities (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Abstract]
Cost	$ 326,467,650	$ 159,239,931
Gross Unrealized Gains	1,369,083	2,365,899
Gross Unrealized Losses	(837,497)	(690,895)
Fair Market Value	326,999,236	160,914,935
Mutual funds
Debt Securities, Available-for-sale [Abstract]
Cost	201,961,325	153,177,675
Gross Unrealized Gains	1,341,184	2,339,639
Gross Unrealized Losses	(812,450)	(644,140)
Fair Market Value	$ 202,490,059	$ 154,873,174
U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Contractual Maturity (in years)	1 year
Debt Securities, Available-for-sale [Abstract]
Cost	$ 119,670,627
Gross Unrealized Gains	0
Gross Unrealized Losses	(2,087)
Fair Market Value	$ 119,668,540
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Contractual Maturity (in years)	1 year	1 year
Debt Securities, Available-for-sale [Abstract]
Cost	$ 2,975,870	$ 3,000,000
Gross Unrealized Gains	16,110	26,260
Gross Unrealized Losses	(343)	(10,000)
Fair Market Value	2,991,637	3,016,260
U.S. agency mortgage-backed securities
Debt Securities, Available-for-sale [Abstract]
Cost	1,859,828	3,062,256
Gross Unrealized Gains	11,789	0
Gross Unrealized Losses	(22,617)	(36,755)
Fair Market Value	$ 1,849,000	$ 3,025,501

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Debt Securities, Available-for-sale contractual maturity.

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