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Concentrations (Details)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Concentration of purchase from suppliers    
Concentration risk supplier, percentage 10.00% 10.00%
Purchase [Member] | Supplier A [Member]    
Concentration of purchase from suppliers    
Concentration risk supplier, percentage 17.00% 17.00%
Purchase [Member] | Supplier B [Member]    
Concentration of purchase from suppliers    
Concentration risk supplier, percentage 12.00% 14.00%
Purchase [Member] | Supplier C [Member]    
Concentration of purchase from suppliers    
Concentration risk supplier, percentage 10.00% 10.00%
Purchase [Member] | Supplier D [Member]    
Concentration of purchase from suppliers    
Concentration risk supplier, percentage 10.00% [1]
[1] Less than 10%.