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Long-term investments -Additional Information (Detail)
 1 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
Jan. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Jul. 31, 2017
USD ($)
Jul. 31, 2015
USD ($)
Jul. 31, 2015
CNY (¥)
Cost Method Investments     $ 42,430,000 $ 39,002,000 $ 9,157,000      
Disposal Group, Including Discontinued Operation, Consideration             $ 19,896,000 ¥ 130,000,000
Equity Method Investment, Deferred Gain on Sale   $ 326,000 326,000 [1] 0 [1]        
Other than Temporary Impairment Losses, Investments     596,000      
Cost Method Investment, Deferred Gain on Sale [2]     $ 165,000 $ 689,000        
Hangzhou Feixiang [Member]                
Cost Method Investments Ownership Percentage [3]     28.00% 20.00%        
Disposal Group, Including Discontinued Operation, Other Income     $ 1,530,000          
Equity Method Investment, Ownership Percentage     20.00% 28.00%        
Yunhui Tianxia [Member]                
Cost Method Investments Ownership Percentage     7.50% 13.70%        
Cost Method Investments           $ 1,263,000    
Shanghai Lexiang [Member]                
Cost Method Investments Ownership Percentage   14.12% 14.12% [2] 15.00% [2]        
Equity Method Investment, Ownership Percentage     28.77% 43.16%        
Cost Method Investment, Deferred Gain on Sale   $ 222,000            
Shenzhen Kushiduo [Member]                
Cost Method Investments Ownership Percentage 10.00%   0.00% [4] 10.00% [4]        
Cost Method Investments $ 383,000              
Disposal Group, Including Discontinued Operation, Consideration 191,500              
Disposal Group, Including Discontinued Operation, Other Income $ 191,500              
Shanghai Guozhi [Member]                
Cost Method Investments Ownership Percentage [5]     16.80% 16.80%        
Other than Temporary Impairment Losses, Investments     $ 149,000          
Guangzhou Hongsi [Member]                
Cost Method Investments Ownership Percentage [5]     19.90% 19.90%        
Other than Temporary Impairment Losses, Investments     $ 447,000          
Shenzhen Xunlei [Member]                
Equity Method Investment, Ownership Percentage [1]     28.77% 43.16%        
[1] In 2016, the Group made an equity investment in a privately-held company, Big Data, of USD 1,442,000 for 43.16% equity interest. The Group classified Big Data as an equity method investment as it had only significant influence instead of control over Big Data. In January of 2017, Big Data issued certain new shares to a third party and its original shareholders and the Group’s interest in Big Data diluted from 43.16% to 28.77% with a dilution gain of USD 326,000 arising from the deemed disposal. As at December 31, 2017, the Group recognized full impairment of USD 1,251,000 for its interest in Big Data as share of loss from equity investees after taking into account the latest operation status and financial position of Big Data.
[2] In January of 2017, Shanghai Lexiang issued new shares to a third party investor resulting in the Group’s interest in Shanghai Lexiang diluted from 15% to 14.12% with a dilution gain of USD 222,000 arising from the deemed disposal.
[3] In May 2017, the Group made additional investment by USD 1,263,000 in Yunhui Tianxia from 7.5% to 13.7%. In July 2017, the Group also made additional equity investment in Hangzhou Feixiang of USD 1,530,000. As the result of the new investment, the Group’s equity interest increased from 20% to 28% and the Group continued to use the cost method to account for this investment due to the lack of significant influence over the investee.
[4] In June 2017, the Group disposed of entire interests (10%) in Shenzhen Kushiduo with a carrying value of USD 383,000 at a consideration of approximately USD 191,500. As a result of the disposal, the Group recognized in a disposal loss of USD 191,500 in the other income, net (Note 23).
[5] The Group recognized impairment against its investments in Shanghai Guozhi and Guangzhou Hongsi of USD 149,000 and USD 447,000, respectively after considering the latest operation status and financial and liquidity position.