Basis of Presentation and Summary of Significant Accounting Policies - Carrying Amounts and Fair Values of Company's Financial Instruments (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market accounts	$ 50,731,008	$ 85,500,745
Marketable securities – certificates of deposit	116,468,555	1,066,103
Marketable securities – equity securities	70,118	60,999
Total	167,269,681	86,627,847
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market accounts	50,731,008	85,500,745
Marketable securities – certificates of deposit	116,468,555	1,066,103
Marketable securities – equity securities	70,118	60,999
Total	167,269,681	86,627,847
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market accounts	0	0
Marketable securities – certificates of deposit	0	0
Marketable securities – equity securities	0	0
Total	0	0
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market accounts	0	0
Marketable securities – certificates of deposit	0	0
Marketable securities – equity securities	0	0
Total	$ 0	$ 0