Fair Value Measurements - Summary of Debt Securities, Available-for-sale (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cost or Amortized Cost	$ 1,687,815	$ 1,165,428
Unrealized Gains	2	1,687
Unrealized Losses	(11,478)	(9)
Allowance for credit losses	0	0
Fair value	1,676,339	1,167,106
Term deposits
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cost or Amortized Cost	30,580	30,937
Unrealized Gains	0	0
Unrealized Losses	0	0
Allowance for credit losses	0	0
Fair value	30,580	30,937
Asset-backed securities
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cost or Amortized Cost	24,447	93,990
Unrealized Gains	0	193
Unrealized Losses	(5)	0
Allowance for credit losses	0	0
Fair value	24,442	94,183
Government debt securities
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cost or Amortized Cost	1,238,761	640,270
Unrealized Gains	0	902
Unrealized Losses	(9,660)	0
Allowance for credit losses	0	0
Fair value	1,229,101	641,172
Municipal securities
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cost or Amortized Cost	237,514
Unrealized Gains	2
Unrealized Losses	(1,505)
Allowance for credit losses	0
Fair value	236,011
Corporate debt securities
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cost or Amortized Cost	156,513	400,231
Unrealized Gains	0	592
Unrealized Losses	(308)	(9)
Allowance for credit losses	0	0
Fair value	$ 156,205	$ 400,814

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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