Financial Instruments - Summary of Estimated Fair Value and Related Valuation Input Hierarchy of Available-for-Sale Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Schedule of Available-for-sale Securities [Line Items]
Total Fair Value	$ 330,033	$ 369,472
Fair Value, Measurements, Recurring
Schedule of Available-for-sale Securities [Line Items]
Total Amortized Cost	332,651	369,840
Total Unrealized Gain	2	8
Total Unrealized Loss	(2,620)	(376)
Total Fair Value	330,033	369,472
Fair Value, Measurements, Recurring | Money Market Funds | Level 1
Schedule of Available-for-sale Securities [Line Items]
Total Amortized Cost	43,419	89,738
Total Unrealized Gain	0	0
Total Unrealized Loss	0	0
Total Fair Value	43,419	89,738
Fair Value, Measurements, Recurring | U.S. Treasury Obligations | Level 2
Schedule of Available-for-sale Securities [Line Items]
Total Amortized Cost	116,399	111,832
Total Unrealized Gain	0	1
Total Unrealized Loss	(722)	(138)
Total Fair Value	115,677	111,695
Fair Value, Measurements, Recurring | Government Agency Obligations | Level 2
Schedule of Available-for-sale Securities [Line Items]
Total Amortized Cost	22,448	21,346
Total Unrealized Gain	0	0
Total Unrealized Loss	(167)	(23)
Total Fair Value	22,281	21,323
Fair Value, Measurements, Recurring | Corporate Debt Obligations | Level 2
Schedule of Available-for-sale Securities [Line Items]
Total Amortized Cost	115,132	99,757
Total Unrealized Gain	2	6
Total Unrealized Loss	(1,627)	(190)
Total Fair Value	113,507	99,573
Fair Value, Measurements, Recurring | Commercial Paper | Level 2
Schedule of Available-for-sale Securities [Line Items]
Total Amortized Cost	23,453	36,993
Total Unrealized Gain	0	0
Total Unrealized Loss	0	0
Total Fair Value	23,453	36,993
Fair Value, Measurements, Recurring | Asset-Backed Securities | Level 2
Schedule of Available-for-sale Securities [Line Items]
Total Amortized Cost	11,800	10,174
Total Unrealized Gain	0	1
Total Unrealized Loss	(104)	(25)
Total Fair Value	11,696	10,150
Fair Value, Measurements, Recurring | Amounts Classified As Cash Equivalents
Schedule of Available-for-sale Securities [Line Items]
Total Amortized Cost	(69,411)	(104,488)
Total Unrealized Gain	0	0
Total Unrealized Loss	(1)	0
Total Fair Value	(69,410)	(104,488)
Fair Value, Measurements, Recurring | Amounts Classified As Short-Term Investments
Schedule of Available-for-sale Securities [Line Items]
Total Amortized Cost	263,240	265,352
Total Unrealized Gain	2	8
Total Unrealized Loss	(2,619)	(376)
Total Fair Value	$ 260,623	$ 264,984