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Basis of Presentation and Summary of Significant Accounting Policies - Investment Categories (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities, Available-for-sale |  |
Amortized cost | $ 135,181 | $ 150,187
Gross unrealized gains | 3,435 | 57
Gross unrealized losses | (1,854) | (6,626)
Estimated fair value | 136,762 | 143,618
Total short-term investments | 160,912 | 183,858
U.S. Treasuries |  |
Debt Securities, Available-for-sale |  |
Amortized cost | 64,970 | 78,442
Gross unrealized gains | 5 | 19
Gross unrealized losses | (7) | (13)
Estimated fair value | 64,968 | 78,448
Commercial paper |  |
Debt Securities, Available-for-sale |  |
Amortized cost | 29,311 | 23,483
Gross unrealized gains | 5 | 5
Gross unrealized losses | (7) | (6)
Estimated fair value | 29,309 | 23,482
Corporate notes/bonds |  |
Debt Securities, Available-for-sale |  |
Amortized cost | 18,278 | 15,496
Gross unrealized gains | 17 | 21
Gross unrealized losses | (10) | (8)
Estimated fair value | 18,285 | 15,509
Certificates of Deposit |  |
Debt Securities, Available-for-sale |  |
Amortized cost | 17,093 | 22,812
Gross unrealized gains | 6 | 12
Gross unrealized losses | (1) | (4)
Estimated fair value | 17,098 | 22,820
Corporate equity securities |  |
Debt Securities, Available-for-sale |  |
Amortized cost | 5,529 | 9,954
Gross unrealized gains | 3,402 | 0
Gross unrealized losses | (1,829) | (6,595)
Estimated fair value | 7,102 | 3,359
Common Stock |  |
Debt Securities, Available-for-sale |  |
Viking common stock | $ 24,150 | $ 40,240

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