Quarterly report pursuant to Section 13 or 15(d)

Significant accounting policies (Revenue recognition and accounts receivable) (Details)

v3.4.0.3
Significant accounting policies (Revenue recognition and accounts receivable) (Details) - Customer Concentration [Member] - Net Sales [Member]
3 Months Ended
Mar. 31, 2015
item
Concentration Risk [Line Items]  
Number of customers 3
Customer One [Member]  
Concentration Risk [Line Items]  
Risk percentage 12.00%
Customer Two [Member]  
Concentration Risk [Line Items]  
Risk percentage 44.00%
Customer Three [Member]  
Concentration Risk [Line Items]  
Risk percentage 44.00%