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Concentrations of Credit Risk and Major Customers (Tables)
 12 Months Ended
Dec. 31, 2017
Customers [Member]  
Concentration Risk [Line Items]  
Summary of customers and suppliers
  For the Years Ended 
  December 31, 
Customer 2017  2016  2015 
          
Customer A  *%  12.00%  *%
Customer B  10.89%  12.67%  12.54%

 

* Less than 10%
Suppliers [Member]  
Concentration Risk [Line Items]  
Summary of customers and suppliers
  For the Years Ended
December 31,		 
Supplier 2017  2016  2015 
Supplier A  10.65%  14.12%  * 
Supplier B  13.23%  13.39%  15.51%

 

* Less than 10%