Fair Value Measurements - Fair Value Measurements, Recurring and Nonrecurring (Detail) - USD ($)	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	$ 28,705,037	$ 37,249,189	$ 675,594
Financial Instruments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents	285,792,378	83,757,785
Investments	50,627,826	40,794,806
Contingent Consideration Payable	(108,024,422)	(27,100,000)
Warrant Liability	(34,003,000)	(39,454,000)
Fair Value, Net Asset (Liability)	194,392,782	57,998,591
Fair Value, Inputs, Level 1 [member] | Financial Instruments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents	285,792,378	83,757,785
Investments	29,520,367	923,581
Contingent Consideration Payable	0	0
Warrant Liability	0	0
Fair Value, Net Asset (Liability)	315,312,745	84,681,366
Fair Value, Inputs, Level 2 [member] | Financial Instruments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents	0	0
Investments	0	0
Contingent Consideration Payable	0	0
Warrant Liability	0	0
Fair Value, Net Asset (Liability)	0	0
Fair Value, Inputs, Level 3 [member] | Financial Instruments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents	0	0
Investments	21,107,459	39,871,225
Contingent Consideration Payable	(108,024,422)	(27,100,000)
Warrant Liability	(34,003,000)	(39,454,000)
Fair Value, Net Asset (Liability)	$ (120,919,963)	$ (26,682,775)