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Basis of Presentation and Summary of Significant Accounting Policies - Investment Categories (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | $ 127,996 | $ 292,225
Gross unrealized gains | 436 | 842
Gross unrealized losses | (5,184) | (2,370)
Estimated fair value | 123,248 | 290,697
Total short-term investments | 142,655 | 321,586
Bank deposits |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 2,504 | 63,389
Gross unrealized gains | 0 | 13
Gross unrealized losses | (61) | (21)
Estimated fair value | 2,443 | 63,381
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 4,904 | 29,308
Gross unrealized gains | 0 | 17
Gross unrealized losses | (121) | (38)
Estimated fair value | 4,783 | 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 | 307 | 402
Gross unrealized losses | (3,703) | (2,027)
Estimated fair value | 2,411 | 4,182
Mutual fund |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 112,535 | 152,136
Gross unrealized gains | 0 | 0
Gross unrealized losses | (1,228) | (249)
Estimated fair value | 111,307 | 151,887
US government securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 2,246 | 5,577
Gross unrealized gains | 0 | 0
Gross unrealized losses | (71) | (23)
Estimated fair value | 2,175 | 5,554
Warrants |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 0 | 0
Gross unrealized gains | 129 | 408
Gross unrealized losses | 0 | 0
Estimated fair value | 129 | 408
Common Stock |  |
Debt Securities, Available-for-sale [Line Items] |  |
Viking common stock | $ 19,407 | $ 30,889

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