Annual report pursuant to Section 13 and 15(d)

Organization and summary of significant accounting policies (Revenue recognition and accounts receivable) (Details)

v3.7.0.1
Organization and summary of significant accounting policies (Revenue recognition and accounts receivable) (Details) - Customer Concentration [Member] - Net Sales [Member]
12 Months Ended
Dec. 31, 2015
Customers
Concentration Risk [Line Items]  
Number of customers 3
Customer One [Member]  
Concentration Risk [Line Items]  
Risk percentage 52.00%
Customer Two [Member]  
Concentration Risk [Line Items]  
Risk percentage 26.00%
Customer Three [Member]  
Concentration Risk [Line Items]  
Risk percentage 22.00%