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Long-term investments - Schedule of Long-Term Investments (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Equity method investments: |  |  |
Share of loss from equity investees |  |  | $ (307)
Cost method investments: |  |  |
Balance at beginning of the year | $ 26,365 | $ 33,638 |
Additions |  | 2,838 |
Disposal |  | (1,055) |
Net unrealized gains on investments held | 794 | 10,907 |
Exchange difference | 369 | (132) |
Less: impairment loss on long-term investments | (794) | (19,831) |
Balance at end of the year | 26,734 | 26,365 | $ 33,638
Total long-term investments | $ 26,734 | $ 26,365 |

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