Convertible Senior Notes - Convertible Debt (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Dec. 14, 2023
Debt Instrument [Line Items]
Total convertible senior notes	$ 521,607	$ 510,143
1.00% Convertible Senior Notes due 2028
Debt Instrument [Line Items]
Principal amount	600,000	600,000	$ 309,900
Unamortized debt discount	(71,261)	(81,457)
Unamortized debt issuance costs	(7,132)	(8,400)
Total convertible senior notes	521,607	510,143
0.375% Convertible Senior Notes due 2024
Debt Instrument [Line Items]
Principal amount	0	69,700	$ 217,700
Unamortized debt issuance costs	0	(248)
Total convertible senior notes	$ 0	$ 69,452