Discontinued operations (Schedule of Discontinued Operations) (Details) - USD ($)
$ in Thousands
12 Months Ended
Jul. 15, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Results of the discontinued operation        
Income tax benefit / (expense)   $ (2,048) $ 1,923 $ 1,207
Current liabilities        
Total current liabilities   27,367  
Xunlei Kankan [Member]        
Results of the discontinued operation        
Revenues, net of rebates and discounts   $ 15,677 47,075 58,213
Business taxes and surcharges   (447) (1,480) (1,746)
Net revenues   15,230 45,595 56,467
Cost of revenues   (13,240) (42,704) (43,002)
Gross profit   1,990 2,891 13,465
Research and development expenses   (3,245) (6,035) (7,092)
Sales and marketing expenses   (7,384) (15,726) (16,762)
General and administrative expenses   (3,051) (3,016) (4,410)
Total operating expenses   (13,680) (24,777) (28,264)
Net gain from exchanges of content copyrights   137 1,556 1,020
Operating loss   (11,553) $ (20,330) $ (13,779)
Gain on disposal recognized $ 1,505 1,505
Income tax benefit / (expense)   (2,048) $ 1,923 $ 1,207
Loss from discontinued operations   (12,096) (18,407) (12,572)
Assets        
Accounts receivable, net     23,741  
Prepayments and other current assets     670  
Copyrights related to content-current portion     16,013  
Property and equipment, net     1,111  
Intangible assets     4,997  
Prepayment for content     456  
Other long-term prepayments and receivables     57  
Total assets held for sale     47,045  
Current liabilities        
Accounts payables     25,267  
Deferred revenue, current portion     1,018  
Accrued liabilities and other payables     1,082  
Total liabilities held for sale     27,367  
Cash flows generated from/ (used in) discontinued operations        
Net cash generated from/(used in) operating activities   (1,554) 2,293 10,439
Net cash (used in)/generated from investing activities   $ 9,135 $ (34,661) $ (16,402)
Net cash used in financing activities  
Net cash flow for the year   $ 7,581 $ (32,368) $ (5,963)