Quarterly report pursuant to Section 13 or 15(d)

Major Customers and Vendors (Details)

v3.8.0.1
Major Customers and Vendors (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
customer
Sep. 30, 2016
customer
Sep. 30, 2017
USD ($)
customer
Sep. 30, 2016
customer
Jul. 31, 2016
USD ($)
Significant Customers and Vendors          
Vendor prepayments | $ $ 7,471   $ 7,471   $ 8,000
Purchases | Vendor concentration risk          
Significant Customers and Vendors          
Number of vendors 2 2 2 2  
Purchases | Vendor concentration risk | Major vendor one          
Significant Customers and Vendors          
Percentage of concentration risk 27.90% 23.60% 27.00% 23.80%  
Purchases | Vendor concentration risk | Major vendor two          
Significant Customers and Vendors          
Percentage of concentration risk 14.10% 10.50% 14.10% 10.20%  
Net sales | Customer concentration risk          
Significant Customers and Vendors          
Number of customers 2 2 2 2  
Net sales | Customer one | Customer concentration risk          
Significant Customers and Vendors          
Percentage of concentration risk 24.40% 21.40% 22.50% 19.80%  
Net sales | Customer two | Customer concentration risk          
Significant Customers and Vendors          
Percentage of concentration risk 18.50% 17.50% 19.30% 17.80%  
Net accounts receivable | Customer concentration risk          
Significant Customers and Vendors          
Number of customers 2        
Net accounts receivable | Customer one | Customer concentration risk          
Significant Customers and Vendors          
Percentage of concentration risk 14.80%        
Net accounts receivable | Customer two | Customer concentration risk          
Significant Customers and Vendors          
Percentage of concentration risk 25.50%