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Basis of Presentation and Summary of Significant Accounting Policies - Investment Categories (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale
Amortized cost	$ 98,954	$ 120,874
Gross unrealized gains	87	79
Gross unrealized losses	(6,327)	(5,783)
Estimated fair value	92,714	115,170
Total short-term investments	156,024	147,355
Bond fund
Debt Securities, Available-for-sale
Amortized cost	39,512	63,763
Gross unrealized gains	0	0
Gross unrealized losses	(265)	(537)
Estimated fair value	39,247	63,226
U.S. government securities
Debt Securities, Available-for-sale
Amortized cost	19,051	6,736
Gross unrealized gains	31	18
Gross unrealized losses	0	(3)
Estimated fair value	19,082	6,751
Bank deposits
Debt Securities, Available-for-sale
Amortized cost	12,280	17,165
Gross unrealized gains	21	12
Gross unrealized losses	0	(1)
Estimated fair value	12,301	17,176
Corporate bonds
Debt Securities, Available-for-sale
Amortized cost	10,969	14,850
Gross unrealized gains	30	40
Gross unrealized losses	(3)	(2)
Estimated fair value	10,996	14,888
Commercial paper
Debt Securities, Available-for-sale
Amortized cost	10,591	11,578
Gross unrealized gains	5	9
Gross unrealized losses	(1)	(1)
Estimated fair value	10,595	11,586
Municipal bonds
Debt Securities, Available-for-sale
Amortized cost		1,007
Gross unrealized gains		0
Gross unrealized losses		(4)
Estimated fair value		1,003
Corporate equity securities
Debt Securities, Available-for-sale
Amortized cost	6,551	5,775
Gross unrealized gains	0	0
Gross unrealized losses	(6,058)	(5,235)
Estimated fair value	493	540
Common Stock
Debt Securities, Available-for-sale
Viking common stock	$ 63,310	$ 32,185

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