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Basis of Presentation and Summary of Significant Accounting Policies - Investment Categories (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | $ 139,424 | $ 108,778
Gross unrealized gains | 205 | 415
Gross unrealized losses | (5,051) | (5,451)
Estimated fair value | 134,578 | 103,742
Total short-term investments | 193,937 | 166,864
Bank deposits |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 19,691 | 5,012
Gross unrealized gains | 3 | 2
Gross unrealized losses | (26) | (34)
Estimated fair value | 19,668 | 4,980
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 9,592 | 6,701
Gross unrealized gains | 63 | 13
Gross unrealized losses | (37) | (58)
Estimated fair value | 9,618 | 6,656
Agency bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 979 |
Gross unrealized gains | 2 |
Gross unrealized losses | 0 |
Estimated fair value | 981 |
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 13,461 | 7,211
Gross unrealized gains | 2 | 3
Gross unrealized losses | (9) | 0
Estimated fair value | 13,454 | 7,214
Municipal bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 1,005 |
Gross unrealized gains | 0 |
Gross unrealized losses | (5) |
Estimated fair value | 1,000 |
Corporate equity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 5,775 | 5,807
Gross unrealized gains | 0 | 262
Gross unrealized losses | (4,120) | (4,239)
Estimated fair value | 1,655 | 1,830
Bond fund |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 82,678 | 81,815
Gross unrealized gains | 0 | 0
Gross unrealized losses | (807) | (1,050)
Estimated fair value | 81,871 | 80,765
US government securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 6,243 | 2,232
Gross unrealized gains | 2 | 0
Gross unrealized losses | (47) | (70)
Estimated fair value | 6,198 | 2,162
Warrants |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 0 | 0
Gross unrealized gains | 133 | 135
Gross unrealized losses | 0 | 0
Estimated fair value | 133 | 135
Common Stock |  |
Debt Securities, Available-for-sale [Line Items] |  |
Viking common stock | $ 59,359 | $ 63,122

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