Basis of Presentation and Summary of Significant Accounting Policies - Investment Categories (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 158,508	$ 108,778
Gross unrealized gains	288	415
Gross unrealized losses	(4,340)	(5,451)
Estimated fair value	154,456	103,742
Total short-term investments	190,596	166,864
Bank deposits
Debt Securities, Available-for-sale [Line Items]
Amortized cost	36,327	5,012
Gross unrealized gains	7	2
Gross unrealized losses	(22)	(34)
Estimated fair value	36,312	4,980
Bond fund
Debt Securities, Available-for-sale [Line Items]
Amortized cost	83,695	81,815
Gross unrealized gains	0	0
Gross unrealized losses	(808)	(1,050)
Estimated fair value	82,887	80,765
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized cost	18,582	7,211
Gross unrealized gains	1	3
Gross unrealized losses	(8)	0
Estimated fair value	18,575	7,214
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized cost	6,197	6,701
Gross unrealized gains	1	13
Gross unrealized losses	(39)	(58)
Estimated fair value	6,159	6,656
Corporate equity securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	5,775	5,807
Gross unrealized gains	0	262
Gross unrealized losses	(3,436)	(4,239)
Estimated fair value	2,339	1,830
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Amortized cost	1,016
Gross unrealized gains	0
Gross unrealized losses	(10)
Estimated fair value	1,006
US government securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	6,916	2,232
Gross unrealized gains	1	0
Gross unrealized losses	(17)	(70)
Estimated fair value	6,900	2,162
Warrants
Debt Securities, Available-for-sale [Line Items]
Amortized cost	0	0
Gross unrealized gains	278	135
Gross unrealized losses	0	0
Estimated fair value	278	135
Common Stock
Debt Securities, Available-for-sale [Line Items]
Viking common stock	$ 36,140	$ 63,122