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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