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Long-term investments - Schedule of Long-Term Investments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Equity method investments:      
Balance at beginning of the year $ 0 $ 311  
Share of loss from equity investees 0 (307) $ (1,875)
Exchange differences 0 (4)  
Balance at end of the year 0 0 311
Cost method investments:      
Balance at beginning of the year 33,638 42,430  
Additions 2,838 0  
Disposal (1,055) 0  
Dilution gains arising from deemed disposal of investment 10,907 0  
Exchange difference (132) (998)  
Less: impairment loss on long-term investments [1] (19,831) (7,794)  
Balance at end of the year 26,365 33,638 $ 42,430
Total long-term investments $ 26,365 $ 33,638  
[1] In 2019, the Group recognized impairment against its investments in Shanghai Lexiang, Cloudtropy and Beijing Cloudin of USD 14,518,000,USD 4,213,000 and USD 1,100,000, respectively after considering the latest operation status and financial and liquidity position of respective investees.