v3.22.2.2
Investment Securities - Summary of Investment Securities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 534,851 $ 320,333
Unrealized Gains 1 20
Unrealized (Losses) (5,497) (385)
Estimated Fair Value 529,355 319,968
U.S. Government Agency Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 183,278 71,752
Unrealized Gains 1 0
Unrealized (Losses) (2,070) (100)
Estimated Fair Value 181,209 71,652
FDIC Certificates of Deposit [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 3,177  
Unrealized Gains 0  
Unrealized (Losses) (73)  
Estimated Fair Value 3,104  
Certificates of Deposit [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 7,500 26,232
Unrealized Gains 0 1
Unrealized (Losses) 0 0
Estimated Fair Value 7,500 26,233
Commercial Paper [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 125,043 55,955
Unrealized Gains 0 0
Unrealized (Losses) (372) (36)
Estimated Fair Value 124,671 55,919
Corporate Notes/Bonds [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 215,853 166,394
Unrealized Gains 0 19
Unrealized (Losses) (2,982) (249)
Estimated Fair Value $ 212,871 $ 166,164