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Long-term investments - Additional Information (Details) - USD ($)
1 Months Ended
Jan. 31, 2019
Dec. 31, 2019
Jul. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cost Method Investments.   $ 26,365,000   $ 33,638,000 $ 42,430,000
Shanghai Lexiang [Member]          
Cost Method Investments   14,518,000      
Equity method investment   1,176,000      
Cloudtropy [Member]          
Cost Method Investments   4,213,000      
Beijing Cloudin Technology [Member]          
Cost Method Investments   1,100,000      
Shen Zhen Arashi [Member]          
Equity method investment   $ 12,083,000      
Gain on disposal of equity interest $ 579,000        
Percent of equity interest owned 1.25%        
Shenzhen Xunlei [Member]          
Equity method investment     $ 2,838,000    
Chengdu Diting [Member]          
Percent of equity interest owned   12.74%   12.74%  
Guangzhou Yuechuan [Member]          
Percent of equity interest owned   9.30%   9.30%  
Zhuhai Qianyou [Member]          
Percent of equity interest owned   19.00%   19.00%