Marketable Securities: Available-For-Sale Debt Securities - Schedule of Investments in Available-for-Sale Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Debt Securities, Available-for-Sale [Line Items]
Amortized cost	$ 30,214	$ 196,423
Gross unrealized gains	4	157
Gross unrealized losses	(2)	(2)
Aggregate estimated fair value	30,216	196,578
Commercial paper
Debt Securities, Available-for-Sale [Line Items]
Aggregate estimated fair value	6,743	52,589
Corporate debt securities
Debt Securities, Available-for-Sale [Line Items]
Aggregate estimated fair value	13,469	58,299
United Kingdom Government Securities
Debt Securities, Available-for-Sale [Line Items]
Aggregate estimated fair value		66,175
United States Treasury Bills
Debt Securities, Available-for-Sale [Line Items]
Aggregate estimated fair value	10,004	19,515
within 1 year \| Commercial paper
Debt Securities, Available-for-Sale [Line Items]
Amortized cost	6,743	52,569
Gross unrealized gains	0	21
Gross unrealized losses	0	(1)
Aggregate estimated fair value	6,743	52,589
within 1 year \| Corporate debt securities
Debt Securities, Available-for-Sale [Line Items]
Amortized cost	13,468	58,226
Gross unrealized gains	2	74
Gross unrealized losses	(1)	(1)
Aggregate estimated fair value	13,469	58,299
within 1 year \| United Kingdom Government Securities
Debt Securities, Available-for-Sale [Line Items]
Amortized cost		66,162
Gross unrealized gains		12
Gross unrealized losses		0
Aggregate estimated fair value		66,174
within 1 year \| United States Treasury Bills
Debt Securities, Available-for-Sale [Line Items]
Amortized cost	10,003	19,466
Gross unrealized gains	2	50
Gross unrealized losses	(1)	0
Aggregate estimated fair value	$ 10,004	$ 19,516

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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