Basis of Presentation and Summary of Significant Accounting Policies - Investment Categories (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale
Amortized cost	$ 184,293	$ 120,874
Gross unrealized gains	21	79
Gross unrealized losses	(5,814)	(5,783)
Estimated fair value	178,500	115,170
Total short-term investments	260,500	147,355
Bond fund
Debt Securities, Available-for-sale
Amortized cost	92,721	63,763
Gross unrealized gains	0	0
Gross unrealized losses	(474)	(537)
Estimated fair value	92,247	63,226
Bank deposits
Debt Securities, Available-for-sale
Amortized cost	24,584	17,165
Gross unrealized gains	6	12
Gross unrealized losses	(8)	(1)
Estimated fair value	24,582	17,176
Corporate bonds
Debt Securities, Available-for-sale
Amortized cost	23,664	14,850
Gross unrealized gains	14	40
Gross unrealized losses	(22)	(2)
Estimated fair value	23,656	14,888
Commercial paper
Debt Securities, Available-for-sale
Amortized cost	21,346	11,578
Gross unrealized gains	1	9
Gross unrealized losses	(12)	(1)
Estimated fair value	21,335	11,586
U.S. government securities
Debt Securities, Available-for-sale
Amortized cost	14,409	6,736
Gross unrealized gains	0	18
Gross unrealized losses	(26)	(3)
Estimated fair value	14,383	6,751
Corporate equity securities
Debt Securities, Available-for-sale
Amortized cost	6,551	5,775
Gross unrealized gains	0	0
Gross unrealized losses	(5,271)	(5,235)
Estimated fair value	1,280	540
Municipal bonds
Debt Securities, Available-for-sale
Amortized cost	1,018	1,007
Gross unrealized gains	0	0
Gross unrealized losses	(1)	(4)
Estimated fair value	1,017	1,003
Common Stock
Debt Securities, Available-for-sale
Viking common stock	$ 82,000	$ 32,185