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Other income, net - Schedule of Other income, net (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Government subsidy income | $ 2,061 | $ 2,096 | $ 2,788
Net unrealized gains arising from long-term investments | 10,907 |  | 491
Investment income/(loss) | 0 | (307) | (1,875)
Investment loss on impairment of long-term investments (note 9) | (19,831) | (7,794) | (596)
Exchange (loss)/gain, net | (402) | 1,216 | (57)
Settlement income | 1,531 | 414 | 533
Others | 366 | 1,061 | 704
Other income, net | 5,861 | 2,810 | 7,880
Linktoken program [Member] |  |  |
Gains from disposal of Linktoken program (note 8) | 6,630 |  |
Short-term Investments [Member] |  |  |
Investment income/(loss) | 4,020 | $ 5,817 | 4,204
Long-term Investments [Member] |  |  |
Investment income/(loss) | $ 579 |  | $ (187)

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