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Other income, net - Schedule of Other income, net (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Government subsidy income | $ 3,206 | $ 2,287 | $ 2,061
Net unrealized gains arising from long-term investments |  | 794 | 10,907
Impairment of long-term investments |  | (794) | (19,831)
Exchange loss, net | (1,205) | (2,948) | (402)
Settlement income |  |  | 1,531
VAT deduction | 818 | 1,361 | 427
Others | (669) | 880 | (61)
Total | 4,678 | 4,737 | 5,861
Linktoken program [Member] |  |  |
Gains from disposal of LinkToken program |  |  | 6,630
Short-term Investments [Member] |  |  |
Investment income | $ 2,486 | $ 2,943 | $ 4,020

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