Stock-Based Compensation (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 03, 2014	Sep. 27, 2013	Oct. 03, 2014	Sep. 27, 2013
Schedule of Employee Service Share-based Compensation [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost	$ 1,553	$ 906	$ 4,736	$ 2,924
General and Administrative Expense [Member]
Schedule of Employee Service Share-based Compensation [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost	869	506	2,925	1,912
Selling and Marketing Expense [Member]
Schedule of Employee Service Share-based Compensation [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost	326	211	906	593
Research and Development Expense [Member]
Schedule of Employee Service Share-based Compensation [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost	$ 358	$ 189	$ 905	$ 419