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Discontinued operations (Narrative) (Details)
12 Months Ended
Jul. 15, 2015
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2017
CNY (¥)
Jul. 31, 2015
USD ($)
Jul. 31, 2015
CNY (¥)
Discontinued operations [Line Items]                  
Sales price               $ 19,896,000 ¥ 130,000,000
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax $ 1,505,000                
Sales Revenue, Services, Net       $ 169,017,000 $ 136,442,000 $ 102,325,000      
Shenzhen Xunyi Network Technology Corp., Ltd. [Member] | Minimum [Member] | Scenario, Forecast [Member]                  
Discontinued operations [Line Items]                  
Sales Revenue, Services, Net   $ 1,225,000 ¥ 8,000,000            
Xunlei Kankan [Member]                  
Discontinued operations [Line Items]                  
Sales price               $ 19,896,000 ¥ 130,000,000
Web Game Business [Member]                  
Discontinued operations [Line Items]                  
Sales price       $ 640,000     ¥ 4,180,000