v2.4.0.8
Stock-based compensation (Tables)
9 Months Ended
Sep. 28, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
Exercise price $ 7.45
Dividend yield  0%
Expected volatility  63.1%
Risk-free interest rate  1.3%
Expected life of options (in years)  6.5