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Intangible assets, net (Schedule of Weighted Average Amortization Periods of Intangible Assets) (Details)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Domain names [Member]    
Weighted average amortization periods of intangible assets    
Weighted average amortization period 15 years 15 years
Technology [Member]    
Weighted average amortization periods of intangible assets    
Weighted average amortization period   5 years
Software [Member]    
Weighted average amortization periods of intangible assets    
Weighted average amortization period 4 years 4 years
Operating rights [Member]    
Weighted average amortization periods of intangible assets    
Weighted average amortization period 2 years 1 year
License [Member]    
Weighted average amortization periods of intangible assets    
Weighted average amortization period 15 years