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Concentrations (Details) - Purchase [Member]
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Supplier A [Member]    
Concentration of purchase from suppliers    
Concentration risk supplier, percentage 18.00%
Supplier B [Member]    
Concentration of purchase from suppliers    
Concentration risk supplier, percentage [1] 11.00%
Supplier C [Member]    
Concentration of purchase from suppliers    
Concentration risk supplier, percentage 22.00%
Supplier D [Member]    
Concentration of purchase from suppliers    
Concentration risk supplier, percentage 22.00%
Suppliers E [Member]    
Concentration of purchase from suppliers    
Concentration risk supplier, percentage 18.00% [1]
Supplier F [Member]    
Concentration of purchase from suppliers    
Concentration risk supplier, percentage 12.00% [1]
[1] Less than 10%.