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Other income, net - Schedule of Other income, net (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Government subsidy income | $ 2,287 | $ 2,061 | $ 2,096
Net unrealized gains arising from long-term investments | 794 | 10,907 |
Investment income |  |  | (307)
Impairment of long-term investments | (794) | (19,831) | (7,794)
Exchange gain/(loss), net | (2,948) | (402) | 1,216
Settlement income |  | 1,531 | 414
Value-added tax deduction | 1,361 | 427 |
Others | 880 | (61) | 1,061
Other income, net | 4,737 | 5,861 | 2,810
Linktoken program [Member] |  |  |
Gains from disposal of Linktoken program |  | 6,630 |
Short-term Investments [Member] |  |  |
Investment income | 2,943 | 4,020 | $ 5,817
Long-term Investments [Member] |  |  |
Investment income | $ 214 | $ 579 |

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