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Long-term Investments - Changes in Long-term Investments (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Long-term investments |  |  |
Balance at the beginning of the year | $ 1,389,199 | $ 1,320,386 | $ 993,630
Investments made/transfers from prepayments/other non-current assets | 186,395 | 162,823 | 374,709
Income (Loss) from equity method investments, net | 76,666 | (12,170) | 13,392
Dividend declared from equity method investments | (12,807) | (10,269) | (4,683)
Disposal of investments | (23,982) | (24,039) | (17,713)
Changes from measurement alternative to consolidation (Note 6) |  |  | (43,988)
Reclassification of equity investment with readily determinable fair value to equity-method investment |  |  | 0
Impairment on investments | (5,972) | (38,689) | (25,706)
Fair value change through earnings | 21,258 | 18,564 | 43,002
Currency translation adjustment | 32,589 | (27,407) | (12,257)
Balance at the end of year | 1,663,346 | 1,389,199 | 1,320,386
Equity Securities Without Readily Determinable Fair Values |  |  |
Long-term investments |  |  |
Balance at the beginning of the year | 295,975 | 201,290 | 196,579
Investments made/transfers from prepayments/other non-current assets | 357 | 136,985 | 70,864
Income (Loss) from equity method investments, net | 0 | 0 | 0
Dividend declared from equity method investments | 0 | 0 | 0
Disposal of investments | (522) | (2,228) | (3,463)
Changes from measurement alternative to consolidation (Note 6) |  |  | (43,988)
Reclassification of equity investment with readily determinable fair value to equity-method investment |  |  | 0
Impairment on investments | (5,972) | (38,689) | (25,706)
Fair value change through earnings | 0 | 0 | 10,877
Currency translation adjustment | 1,854 | (1,383) | (3,873)
Balance at the end of year | 291,692 | 295,975 | 201,290
Equity Method Investment |  |  |
Long-term investments |  |  |
Balance at the beginning of the year | 956,392 | 1,000,828 | 557,501
Investments made/transfers from prepayments/other non-current assets | 186,038 | 25,838 | 303,845
Income (Loss) from equity method investments, net | 76,666 | (12,170) | 13,392
Dividend declared from equity method investments | (12,807) | (10,269) | (4,683)
Disposal of investments | (23,460) | (21,811) | (14,250)
Changes from measurement alternative to consolidation (Note 6) |  |  | 0
Reclassification of equity investment with readily determinable fair value to equity-method investment |  |  | 153,407
Impairment on investments | 0 | 0 | 0
Fair value change through earnings | 0 | 0 | 0
Currency translation adjustment | 30,735 | (26,024) | (8,384)
Balance at the end of year | 1,213,564 | 956,392 | 1,000,828
Equity Securities With Readily Determinable Fair Values |  |  |
Long-term investments |  |  |
Balance at the beginning of the year | 136,832 | 118,268 | 239,550
Investments made/transfers from prepayments/other non-current assets | 0 | 0 | 0
Income (Loss) from equity method investments, net | 0 | 0 | 0
Dividend declared from equity method investments | 0 | 0 | 0
Disposal of investments | 0 | 0 | 0
Changes from measurement alternative to consolidation (Note 6) |  |  | 0
Reclassification of equity investment with readily determinable fair value to equity-method investment |  |  | (153,407)
Impairment on investments | 0 | 0 | 0
Fair value change through earnings | 21,258 | 18,564 | 32,125
Currency translation adjustment | 0 | 0 | 0
Balance at the end of year | $ 158,090 | $ 136,832 | $ 118,268

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