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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