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Basis of Presentation and Summary of Significant Accounting Policies - Investment Categories (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale
Amortized cost	$ 162,093	$ 120,874
Gross unrealized gains	13	79
Gross unrealized losses	(6,323)	(5,783)
Estimated fair value	155,783	115,170
Total short-term investments	208,793	147,355
Bond fund
Debt Securities, Available-for-sale
Amortized cost	93,939	63,763
Gross unrealized gains	0	0
Gross unrealized losses	(474)	(537)
Estimated fair value	93,465	63,226
Bank deposits
Debt Securities, Available-for-sale
Amortized cost	20,427	17,165
Gross unrealized gains	4	12
Gross unrealized losses	(22)	(1)
Estimated fair value	20,409	17,176
Corporate bonds
Debt Securities, Available-for-sale
Amortized cost	19,160	14,850
Gross unrealized gains	8	40
Gross unrealized losses	(53)	(2)
Estimated fair value	19,115	14,888
Commercial paper
Debt Securities, Available-for-sale
Amortized cost	12,702	11,578
Gross unrealized gains	1	9
Gross unrealized losses	(16)	(1)
Estimated fair value	12,687	11,586
U.S. government securities
Debt Securities, Available-for-sale
Amortized cost	9,314	6,736
Gross unrealized gains	0	18
Gross unrealized losses	(55)	(3)
Estimated fair value	9,259	6,751
Corporate equity securities
Debt Securities, Available-for-sale
Amortized cost	6,551	5,775
Gross unrealized gains	0	0
Gross unrealized losses	(5,703)	(5,235)
Estimated fair value	848	540
Municipal bonds
Debt Securities, Available-for-sale
Amortized cost		1,007
Gross unrealized gains		0
Gross unrealized losses		(4)
Estimated fair value		1,003
Common Stock
Debt Securities, Available-for-sale
Viking common stock	$ 53,010	$ 32,185

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