Fair Value Measurement - Summary of Marketable Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Cost	$ 337,480	$ 399,170
Unrealized Gains	695	295
Unrealized Losses	(11,093)	(2,007)
Fair Value	327,082	397,458
Total
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Cost	338,175	399,149
Unrealized Gains	0	295
Unrealized Losses	(11,093)	(2,007)
Fair Value	327,082	397,437
Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Cost	226,159	274,939
Unrealized Gains	0	100
Unrealized Losses	(6,587)	(1,725)
Fair Value	219,572	273,314
Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Cost	87,598	96,713
Unrealized Gains	0	190
Unrealized Losses	(3,589)	(199)
Fair Value	84,009	96,704
U.S. government and agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Cost	19,759	20,235
Unrealized Gains	0	0
Unrealized Losses	(813)	(64)
Fair Value	18,946	20,171
Foreign government and agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Cost	2,659	3,262
Unrealized Gains	0	0
Unrealized Losses	(65)	(19)
Fair Value	2,594	3,243
Municipal/provincial bonds and other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Cost	2,000	4,000
Unrealized Gains	0	5
Unrealized Losses	(39)	0
Fair Value	1,961	4,005
Pending purchases and sales
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Cost	(695)	21
Unrealized Gains	695	0
Unrealized Losses	0	0
Fair Value	$ 0	$ 21