Fair Value Measurements - Fair Value Measurements, Recurring and Nonrecurring (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financial Instruments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents	$ 230,420	$ 83,758
Investments	94,902	40,795
Contingent Consideration Payable	(83,865)	(27,100)
Warrant Liability	(24,877)	(39,454)
Fair Value, Net Asset (Liability)	216,580	57,999
Fair Value, Inputs, Level 1 [member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	19,957
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	230,420	83,758
Investments	44,117	924
Contingent Consideration Payable	0	0
Warrant Liability	0	0
Fair Value, Net Asset (Liability)	274,537	84,682
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]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments		37,249
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	50,785	39,871
Contingent Consideration Payable	(83,865)	(27,100)
Warrant Liability	(24,877)	(39,454)
Fair Value, Net Asset (Liability)	$ (57,957)	$ (26,683)