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Basis of Presentation and Summary of Significant Accounting Policies - Investment Categories (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale |  |
Amortized cost | $ 184,293 | $ 120,874
Gross unrealized gains | 21 | 79
Gross unrealized losses | (5,814) | (5,783)
Estimated fair value | 178,500 | 115,170
Total short-term investments | 260,500 | 147,355
Bond fund |  |
Debt Securities, Available-for-sale |  |
Amortized cost | 92,721 | 63,763
Gross unrealized gains | 0 | 0
Gross unrealized losses | (474) | (537)
Estimated fair value | 92,247 | 63,226
Bank deposits |  |
Debt Securities, Available-for-sale |  |
Amortized cost | 24,584 | 17,165
Gross unrealized gains | 6 | 12
Gross unrealized losses | (8) | (1)
Estimated fair value | 24,582 | 17,176
Corporate bonds |  |
Debt Securities, Available-for-sale |  |
Amortized cost | 23,664 | 14,850
Gross unrealized gains | 14 | 40
Gross unrealized losses | (22) | (2)
Estimated fair value | 23,656 | 14,888
Commercial paper |  |
Debt Securities, Available-for-sale |  |
Amortized cost | 21,346 | 11,578
Gross unrealized gains | 1 | 9
Gross unrealized losses | (12) | (1)
Estimated fair value | 21,335 | 11,586
U.S. government securities |  |
Debt Securities, Available-for-sale |  |
Amortized cost | 14,409 | 6,736
Gross unrealized gains | 0 | 18
Gross unrealized losses | (26) | (3)
Estimated fair value | 14,383 | 6,751
Corporate equity securities |  |
Debt Securities, Available-for-sale |  |
Amortized cost | 6,551 | 5,775
Gross unrealized gains | 0 | 0
Gross unrealized losses | (5,271) | (5,235)
Estimated fair value | 1,280 | 540
Municipal bonds |  |
Debt Securities, Available-for-sale |  |
Amortized cost | 1,018 | 1,007
Gross unrealized gains | 0 | 0
Gross unrealized losses | (1) | (4)
Estimated fair value | 1,017 | 1,003
Common Stock |  |
Debt Securities, Available-for-sale |  |
Viking common stock | $ 82,000 | $ 32,185

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