Fair Value Measurements - Summary of Financial Assets Recognized at Fair Value on Recurring Basis (Detail) - Fair Value on Recurring Basis [Member] - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents and restricted cash equivalents	$ 534,581	$ 124,636
Marketable securities:
Marketable securities	738,454	962,643
Total	1,273,035	1,087,279
U.S. Treasury and Other Government Securities [Member]
Marketable securities:
Marketable securities	242,686	300,477
Financial Institution Debt Securities [Member]
Marketable securities:
Marketable securities	379,861	440,416
Corporate Debt Securities [Member]
Marketable securities:
Marketable securities	101,550	62,349
Other Asset Backed Securities [Member]
Marketable securities:
Marketable securities	14,357	159,401
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents and restricted cash equivalents	534,581	124,636
Marketable securities:
Marketable securities	172,939	280,085
Total	707,520	404,721
Level 1 [Member] | U.S. Treasury and Other Government Securities [Member]
Marketable securities:
Marketable securities	172,939	280,085
Level 2 [Member]
Marketable securities:
Marketable securities	565,515	682,558
Total	565,515	682,558
Level 2 [Member] | U.S. Treasury and Other Government Securities [Member]
Marketable securities:
Marketable securities	69,747	20,392
Level 2 [Member] | Financial Institution Debt Securities [Member]
Marketable securities:
Marketable securities	379,861	440,416
Level 2 [Member] | Corporate Debt Securities [Member]
Marketable securities:
Marketable securities	101,550	62,349
Level 2 [Member] | Other Asset Backed Securities [Member]
Marketable securities:
Marketable securities	$ 14,357	$ 159,401