Investments - Available-for-sale Debt Securities in an Unrealized Loss Position (Detail) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Less than 12 Months, Fair Value	$ 273,674	$ 39,244
Less than 12 Months, Unrealized Losses	(365)	(5)
12 Months or Longer, Fair Value	0	4,012
12 Months or Longer, Unrealized Losses	0	(1)
Total, Fair Value	273,674	43,256
Total, Unrealized Losses	(365)	(6)
U.S treasury bills [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Less than 12 Months, Fair Value	220,548	11,057
Less than 12 Months, Unrealized Losses	(315)	(1)
12 Months or Longer, Fair Value	0	4,012
12 Months or Longer, Unrealized Losses	0	(1)
Total, Fair Value	220,548	15,069
Total, Unrealized Losses	(315)	(2)
U.S agency securities [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items]
Less than 12 Months, Fair Value	53,126	28,187
Less than 12 Months, Unrealized Losses	(50)	(4)
12 Months or Longer, Fair Value	0	0
12 Months or Longer, Unrealized Losses	0	0
Total, Fair Value	53,126	28,187
Total, Unrealized Losses	$ (50)	$ (4)

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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