Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Level 1 [Member] | Convertible Senior Notes [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Convertible notes	$ 287.3	$ 290.7
Convertible notes, interest rate	3.50%	3.50%
Level 2 [Member] | Development Liability [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value	$ 317.8	$ 352.7