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Long-term investments - Schedule of Long-Term Investments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Equity method investments:      
Share of loss from equity investees     $ (307)
Cost method investments:      
Balance at beginning of the year $ 26,365 $ 33,638  
Additions   2,838  
Disposal   (1,055)  
Net unrealized gains on investments held 794 10,907  
Exchange difference 369 (132)  
Less: impairment loss on long-term investments (794) (19,831)  
Balance at end of the year 26,734 26,365 $ 33,638
Total long-term investments $ 26,734 $ 26,365