Stock-Based Compensation (Details) (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]
Employee stock options	$ 666	$ 576	$ 2,138	$ 2,068
Restricted stock	141	283	666	718
Restricted stock units	705	0	1,857	0
Nonemployee stock options	41	47	75	138
Total	$ 1,553	$ 906	$ 4,736	$ 2,924