Quarterly report pursuant to Section 13 or 15(d)

Investments in Marketable Debt Securities, Available-for-Sale - Amortized Cost and Fair Value of Investments in Available for Sale Securities Unrealized Loss Position (Detail)

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Investments in Marketable Debt Securities, Available-for-Sale - Amortized Cost and Fair Value of Investments in Available for Sale Securities Unrealized Loss Position (Detail) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Marketable Securities [Line Items]    
Available for sale securities continuous unrealized loss position for less than 12 months, fair value $ 183,810 $ 56,934
Available for sale securities continuous unrealized loss position for less than 12 months, gross unrealized loss (212) (75)
Available for sale securities continuous unrealized loss position for 12 months or longer, fair value 54,904 57,509
Available for sale securities continuous unrealized loss position for 12 months or longer, gross unrealized loss (2,450) (2,560)
Available for sale securities continuous unrealized loss position, fair value 238,714 114,443
Available for sale securities continuous unrealized loss position, gross unrealized loss (2,662) (2,635)
U.S. treasuries    
Marketable Securities [Line Items]    
Available for sale securities continuous unrealized loss position for less than 12 months, fair value 61,178 9,982
Available for sale securities continuous unrealized loss position for less than 12 months, gross unrealized loss (12) (1)
Available for sale securities continuous unrealized loss position for 12 months or longer, fair value 17,208 20,610
Available for sale securities continuous unrealized loss position for 12 months or longer, gross unrealized loss (370) (415)
Available for sale securities continuous unrealized loss position, fair value 78,386 30,592
Available for sale securities continuous unrealized loss position, gross unrealized loss (382) (416)
U.S. government sponsored entities    
Marketable Securities [Line Items]    
Available for sale securities continuous unrealized loss position for less than 12 months, fair value 0 0
Available for sale securities continuous unrealized loss position for less than 12 months, gross unrealized loss 0 0
Available for sale securities continuous unrealized loss position for 12 months or longer, fair value 469 488
Available for sale securities continuous unrealized loss position for 12 months or longer, gross unrealized loss (66) (58)
Available for sale securities continuous unrealized loss position, fair value 469 488
Available for sale securities continuous unrealized loss position, gross unrealized loss (66) (58)
Corporate debt    
Marketable Securities [Line Items]    
Available for sale securities continuous unrealized loss position for less than 12 months, fair value 120,550 45,251
Available for sale securities continuous unrealized loss position for less than 12 months, gross unrealized loss (188) (59)
Available for sale securities continuous unrealized loss position for 12 months or longer, fair value 31,652 30,423
Available for sale securities continuous unrealized loss position for 12 months or longer, gross unrealized loss (1,644) (1,650)
Available for sale securities continuous unrealized loss position, fair value 152,202 75,674
Available for sale securities continuous unrealized loss position, gross unrealized loss (1,832) (1,709)
Asset-backed securities (“ABS”) and other    
Marketable Securities [Line Items]    
Available for sale securities continuous unrealized loss position for less than 12 months, fair value 2,082 1,701
Available for sale securities continuous unrealized loss position for less than 12 months, gross unrealized loss (12) (15)
Available for sale securities continuous unrealized loss position for 12 months or longer, fair value 5,575 5,988
Available for sale securities continuous unrealized loss position for 12 months or longer, gross unrealized loss (370) (437)
Available for sale securities continuous unrealized loss position, fair value 7,657 7,689
Available for sale securities continuous unrealized loss position, gross unrealized loss $ (382) $ (452)