Fair Value Measurements - Fair Value Measurements, Recurring and Nonrecurring (Detail) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	$ 32,653,878	$ 37,249,189
Financial Instruments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents	359,188,735	83,757,785
Investments	41,725,403	40,794,806
Contingent Consideration Payable	(14,850,000)	(27,100,000)
Warrant Liability	(47,464,750)	(39,454,000)
Fair Value, Net Asset (Liability)	338,599,388	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	359,188,735	83,757,785
Investments	33,667,924	923,581
Contingent Consideration Payable	0	0
Warrant Liability	0	0
Fair Value, Net Asset (Liability)	392,856,659	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	8,057,479	39,871,225
Contingent Consideration Payable	(14,850,000)	(27,100,000)
Warrant Liability	(47,464,750)	(39,454,000)
Fair Value, Net Asset (Liability)	$ (54,257,271)	$ (26,682,775)