v3.26.1
Investments - Available-for-sale Debt Securities in an Unrealized Loss Position (Detail) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Debt Securities, Available-for-Sale [Line Items]    
Less than 12 Months, Fair Value $ 686,509 $ 39,244
Less than 12 Months, Unrealized Losses (1,612) (5)
12 Months or Longer, Fair Value 0 4,012
12 Months or Longer, Unrealized Losses 0 (1)
Total, Fair Value 686,509 43,256
Total, Unrealized Losses (1,612) (6)
U.S treasury bills [Member]    
Debt Securities, Available-for-Sale [Line Items]    
Less than 12 Months, Fair Value 614,843 11,057
Less than 12 Months, Unrealized Losses (1,447) (1)
12 Months or Longer, Fair Value 0 4,012
12 Months or Longer, Unrealized Losses 0 (1)
Total, Fair Value 614,843 15,069
Total, Unrealized Losses (1,447) (2)
U.S agency securities [Member]    
Debt Securities, Available-for-Sale [Line Items]    
Less than 12 Months, Fair Value 71,666 28,187
Less than 12 Months, Unrealized Losses (165) (4)
12 Months or Longer, Fair Value 0 0
12 Months or Longer, Unrealized Losses 0 0
Total, Fair Value 71,666 28,187
Total, Unrealized Losses $ (165) $ (4)