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Fair Value Hierarchy for Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Assets    
Total assets $ 633,358 $ 594,809
Money Market Funds    
Assets    
Total assets 155,752 172,418
U.S. Treasuries    
Assets    
Total assets 22,697 42,308
U.S. Government Agency Securities    
Assets    
Total assets 126,925 88,032
Corporate Debt Securities    
Assets    
Total assets 327,984 292,051
Fair Value, Inputs, Level 1    
Assets    
Total assets 155,752 172,418
Fair Value, Inputs, Level 1 | Money Market Funds    
Assets    
Total assets 155,752 172,418
Fair Value, Inputs, Level 1 | U.S. Treasuries    
Assets    
Total assets   0
Fair Value, Inputs, Level 1 | U.S. Government Agency Securities    
Assets    
Total assets 0 0
Fair Value, Inputs, Level 1 | Corporate Debt Securities    
Assets    
Total assets   0
Fair Value, Inputs, Level 2    
Assets    
Total assets 477,606 422,391
Fair Value, Inputs, Level 2 | Money Market Funds    
Assets    
Total assets 0 0
Fair Value, Inputs, Level 2 | U.S. Treasuries    
Assets    
Total assets 22,697 42,308
Fair Value, Inputs, Level 2 | U.S. Government Agency Securities    
Assets    
Total assets 126,925 88,032
Fair Value, Inputs, Level 2 | Corporate Debt Securities    
Assets    
Total assets 327,984 292,051
Fair Value, Inputs, Level 3    
Assets    
Total assets 0 0
Fair Value, Inputs, Level 3 | Money Market Funds    
Assets    
Total assets 0 0
Fair Value, Inputs, Level 3 | U.S. Treasuries    
Assets    
Total assets 0 0
Fair Value, Inputs, Level 3 | U.S. Government Agency Securities    
Assets    
Total assets   0
Fair Value, Inputs, Level 3 | Corporate Debt Securities    
Assets    
Total assets $ 0 $ 0