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Short-term Investments - Summary of Available-for-sale Securities (Details) - USD ($)	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Abstract]
Cost	$ 157,907,426
Gross Unrealized Gains	1,785,532
Gross Unrealized Losses	(1,157,214)
Fair Market Value	158,535,744
Mutual funds
Debt Securities, Available-for-sale [Abstract]
Cost	152,177,676	$ 66,599,219
Gross Unrealized Gains	1,752,552	754,709
Gross Unrealized Losses	(1,128,029)	(15,911)
Fair Market Value	152,802,199	$ 67,338,017
Corporate debt securities
Debt Securities, Available-for-sale [Abstract]
Cost	1,200,000
Gross Unrealized Gains	0
Gross Unrealized Losses	(27,840)
Fair Market Value	$ 1,172,160
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	32,980
Gross Unrealized Losses	0
Fair Market Value	3,032,980
U.S. agency mortgage-backed securities
Debt Securities, Available-for-sale [Abstract]
Cost	1,529,750
Gross Unrealized Gains	0
Gross Unrealized Losses	(1,345)
Fair Market Value	$ 1,528,405

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Debt Securities, Available-for-sale contractual maturity.

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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