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Long-term Investments - Carrying Value of Equity Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024
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Total carrying value of the equity securities |  |
Initial cost basis | $ 824,316 | $ 824,481
Upward adjustments | 92,736 | 92,736
Downward adjustments | (624,380) | (618,408)
Foreign currency translation | (980) | (2,834)
Total carrying value at the end of the period | $ 291,692 | $ 295,975

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