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Fair Value Measurements - Summary of Financial Assets Recognized at Fair Value on Recurring Basis (Detail) - Fair Value on Recurring Basis [Member] - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Assets    
Cash equivalents and restricted cash equivalents $ 139,880 $ 534,581
Marketable securities:    
Marketable securities 824,513 738,454
Total Assets 964,393 1,273,035
U.S. Treasury and Other Government - Backed Securities [Member]    
Marketable securities:    
Marketable securities 329,943 242,686
Financial Institution Debt Securities [Member]    
Marketable securities:    
Marketable securities 318,578 379,861
Corporate Debt Securities [Member]    
Marketable securities:    
Marketable securities 115,042 101,550
Other Asset Backed Securities [Member]    
Marketable securities:    
Marketable securities 60,950 14,357
Level 1 [Member]    
Assets    
Cash equivalents and restricted cash equivalents 139,880 534,581
Marketable securities:    
Marketable securities 77,781 172,939
Total Assets 217,661 707,520
Level 1 [Member] | U.S. Treasury and Other Government - Backed Securities [Member]    
Marketable securities:    
Marketable securities 77,781 172,939
Level 2 [Member]    
Marketable securities:    
Marketable securities 746,732 565,515
Total Assets 746,732 565,515
Level 2 [Member] | U.S. Treasury and Other Government - Backed Securities [Member]    
Marketable securities:    
Marketable securities 252,162 69,747
Level 2 [Member] | Financial Institution Debt Securities [Member]    
Marketable securities:    
Marketable securities 318,578 379,861
Level 2 [Member] | Corporate Debt Securities [Member]    
Marketable securities:    
Marketable securities 115,042 101,550
Level 2 [Member] | Other Asset Backed Securities [Member]    
Marketable securities:    
Marketable securities $ 60,950 $ 14,357