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Basis of Presentation and Summary of Significant Accounting Policies - Investment Categories (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | $ 103,544 | $ 292,225
Gross unrealized gains | 544 | 842
Gross unrealized losses | (5,062) | (2,370)
Estimated fair value | 99,026 | 290,697
Total short-term investments | 117,291 | 321,586
Bank deposits |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 2,506 | 63,389
Gross unrealized gains | 0 | 13
Gross unrealized losses | (53) | (21)
Estimated fair value | 2,453 | 63,381
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 4,887 | 29,308
Gross unrealized gains | 0 | 17
Gross unrealized losses | (107) | (38)
Estimated fair value | 4,780 | 29,287
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost |  | 36,008
Gross unrealized gains |  | 2
Gross unrealized losses |  | (12)
Estimated fair value |  | 35,998
Corporate equity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 5,807 | 5,807
Gross unrealized gains | 312 | 402
Gross unrealized losses | (3,615) | (2,027)
Estimated fair value | 2,504 | 4,182
Mutual fund |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 88,115 | 152,136
Gross unrealized gains | 0 | 0
Gross unrealized losses | (1,203) | (249)
Estimated fair value | 86,912 | 151,887
US government securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 2,229 | 5,577
Gross unrealized gains | 0 | 0
Gross unrealized losses | (84) | (23)
Estimated fair value | 2,145 | 5,554
Warrants |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 0 | 0
Gross unrealized gains | 232 | 408
Gross unrealized losses | 0 | 0
Estimated fair value | 232 | 408
Common Stock |  |
Debt Securities, Available-for-sale [Line Items] |  |
Viking common stock | $ 18,265 | $ 30,889

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