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Long-term investments - Schedule of Long-Term Investments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cost method investments:      
Balance at beginning of the year $ 26,734 $ 26,734 $ 26,365
Additions 4,627 0  
Net unrealized gains on investments held   794  
Exchange difference 134 369  
Less: Impairment loss on long-term investments   (794)  
Balance at end of the year $ 31,495 $ 26,734 $ 26,734