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Short-term Investments - Summary of Available-for-sale Securities (Details) - USD ($)	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Debt Securities, Available-for-sale [Abstract]
Cost	$ 383,783,332		$ 159,239,931
Gross Unrealized Gains	1,602,498		2,365,899
Gross Unrealized Losses	(633,448)		(690,895)
Fair Market Value	384,752,382		160,914,935
Mutual funds
Debt Securities, Available-for-sale [Abstract]
Cost	207,475,699		153,177,675
Gross Unrealized Gains	1,563,089		2,339,639
Gross Unrealized Losses	(579,056)		(644,140)
Fair Market Value	$ 208,459,732		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	$ 170,203,940
Gross Unrealized Gains	10,943
Gross Unrealized Losses	(4,754)
Fair Market Value	$ 170,210,129
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	$ 2,972,816		3,000,000
Gross Unrealized Gains	25,684		26,260
Gross Unrealized Losses	0		(10,000)
Fair Market Value	2,998,500		3,016,260
U.S. agency mortgage-backed securities
Debt Securities, Available-for-sale [Abstract]
Cost	3,130,877		3,062,256
Gross Unrealized Gains	2,782		0
Gross Unrealized Losses	(49,638)		(36,755)
Fair Market Value	$ 3,084,021		$ 3,025,501

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Debt Securities, Available-for-sale contractual maturity.

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