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Basis of Presentation and Summary of Significant Accounting Policies - Investment Categories (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale |  |
Amortized cost | $ 162,093 | $ 120,874
Gross unrealized gains | 13 | 79
Gross unrealized losses | (6,323) | (5,783)
Estimated fair value | 155,783 | 115,170
Total short-term investments | 208,793 | 147,355
Bond fund |  |
Debt Securities, Available-for-sale |  |
Amortized cost | 93,939 | 63,763
Gross unrealized gains | 0 | 0
Gross unrealized losses | (474) | (537)
Estimated fair value | 93,465 | 63,226
Bank deposits |  |
Debt Securities, Available-for-sale |  |
Amortized cost | 20,427 | 17,165
Gross unrealized gains | 4 | 12
Gross unrealized losses | (22) | (1)
Estimated fair value | 20,409 | 17,176
Corporate bonds |  |
Debt Securities, Available-for-sale |  |
Amortized cost | 19,160 | 14,850
Gross unrealized gains | 8 | 40
Gross unrealized losses | (53) | (2)
Estimated fair value | 19,115 | 14,888
Commercial paper |  |
Debt Securities, Available-for-sale |  |
Amortized cost | 12,702 | 11,578
Gross unrealized gains | 1 | 9
Gross unrealized losses | (16) | (1)
Estimated fair value | 12,687 | 11,586
U.S. government securities |  |
Debt Securities, Available-for-sale |  |
Amortized cost | 9,314 | 6,736
Gross unrealized gains | 0 | 18
Gross unrealized losses | (55) | (3)
Estimated fair value | 9,259 | 6,751
Corporate equity securities |  |
Debt Securities, Available-for-sale |  |
Amortized cost | 6,551 | 5,775
Gross unrealized gains | 0 | 0
Gross unrealized losses | (5,703) | (5,235)
Estimated fair value | 848 | 540
Municipal bonds |  |
Debt Securities, Available-for-sale |  |
Amortized cost |  | 1,007
Gross unrealized gains |  | 0
Gross unrealized losses |  | (4)
Estimated fair value |  | 1,003
Common Stock |  |
Debt Securities, Available-for-sale |  |
Viking common stock | $ 53,010 | $ 32,185

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