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Basis of Presentation and Summary of Significant Accounting Policies - Investment Categories (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale |  |
Amortized cost | $ 98,954 | $ 120,874
Gross unrealized gains | 87 | 79
Gross unrealized losses | (6,327) | (5,783)
Estimated fair value | 92,714 | 115,170
Total short-term investments | 156,024 | 147,355
Bond fund |  |
Debt Securities, Available-for-sale |  |
Amortized cost | 39,512 | 63,763
Gross unrealized gains | 0 | 0
Gross unrealized losses | (265) | (537)
Estimated fair value | 39,247 | 63,226
U.S. government securities |  |
Debt Securities, Available-for-sale |  |
Amortized cost | 19,051 | 6,736
Gross unrealized gains | 31 | 18
Gross unrealized losses | 0 | (3)
Estimated fair value | 19,082 | 6,751
Bank deposits |  |
Debt Securities, Available-for-sale |  |
Amortized cost | 12,280 | 17,165
Gross unrealized gains | 21 | 12
Gross unrealized losses | 0 | (1)
Estimated fair value | 12,301 | 17,176
Corporate bonds |  |
Debt Securities, Available-for-sale |  |
Amortized cost | 10,969 | 14,850
Gross unrealized gains | 30 | 40
Gross unrealized losses | (3) | (2)
Estimated fair value | 10,996 | 14,888
Commercial paper |  |
Debt Securities, Available-for-sale |  |
Amortized cost | 10,591 | 11,578
Gross unrealized gains | 5 | 9
Gross unrealized losses | (1) | (1)
Estimated fair value | 10,595 | 11,586
Municipal bonds |  |
Debt Securities, Available-for-sale |  |
Amortized cost |  | 1,007
Gross unrealized gains |  | 0
Gross unrealized losses |  | (4)
Estimated fair value |  | 1,003
Corporate equity securities |  |
Debt Securities, Available-for-sale |  |
Amortized cost | 6,551 | 5,775
Gross unrealized gains | 0 | 0
Gross unrealized losses | (6,058) | (5,235)
Estimated fair value | 493 | 540
Common Stock |  |
Debt Securities, Available-for-sale |  |
Viking common stock | $ 63,310 | $ 32,185

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