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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Long-term investments |  |  |
Balance at the beginning of the year | $ 993,630 | $ 1,207,651 | $ 1,179,466
Investments made/transfers from prepayments | 374,709 | 151,332 | 278,968
Income from equity method investments, net | 13,392 | (24,069) | 14,217
Dividend declared from equity method investments | (4,683) | (5,772) | (11,695)
Disposal of investments | (17,713) | (36,267) | (80,613)
Changes from measurement alternative to consolidation (Note 6) | (43,988) |  | (66,415)
Impairment on investments | (25,706) | (63,515) | (106,800)
Fair value change through earnings | 43,002 | (196,602) | (13,439)
Currency translation adjustment | (12,257) | (39,128) | 13,962
Balance at the end of year | 1,320,386 | 993,630 | 1,207,651
Equity Securities Without Readily Determinable Fair Values |  |  |
Long-term investments |  |  |
Balance at the beginning of the year | 196,579 | 268,716 | 579,084
Investments made/transfers from prepayments | 70,864 | 36,423 | 96,768
Disposal of investments | (3,463) | (29,974) | (75,667)
Changes from measurement alternative to consolidation (Note 6) | (43,988) |  | (66,415)
Reclassification of equity investment without readily determinable fair values to those with readily determinable fair values |  |  | (142,000)
Impairment on investments | (25,706) | (63,515) | (106,800)
Fair value change through earnings | 10,877 |  | (23,316)
Currency translation adjustment | (3,873) | (15,071) | 7,062
Balance at the end of year | 201,290 | 196,579 | 268,716
Equity Method Investment |  |  |
Long-term investments |  |  |
Balance at the beginning of the year | 557,501 | 502,783 | 311,161
Investments made/transfers from prepayments | 303,845 | 114,909 | 182,200
Income from equity method investments, net | 13,392 | (24,069) | 14,217
Dividend declared from equity method investments | (4,683) | (5,772) | (11,695)
Disposal of investments | (14,250) | (6,293) |
Reclassification of equity investment without readily determinable fair values to those with readily determinable fair values | 153,407 |  |
Currency translation adjustment | (8,384) | (24,057) | 6,900
Balance at the end of year | 1,000,828 | 557,501 | 502,783
Equity Securities With Readily Determinable Fair Values |  |  |
Long-term investments |  |  |
Balance at the beginning of the year | 239,550 | 436,152 | 289,221
Disposal of investments |  |  | (4,946)
Reclassification of equity investment without readily determinable fair values to those with readily determinable fair values | (153,407) |  | 142,000
Fair value change through earnings | 32,125 | (196,602) | 9,877
Balance at the end of year | $ 118,268 | $ 239,550 | $ 436,152

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