Stock Based Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended
	Sep. 28, 2013
Activity in stock option plan
Outstanding, Number of Shares, Beginning Balance	1,570,543
Number of Shares, Options Granted	145,800
Number of Shares, Options Exercised	(373,663)
Number of Shares, Options Cancelled or forfeited	(117,879)
Outstanding, Number of Shares, Ending Balance	1,224,801
Weighted Average Exercise Price Per Share, Beginning Balance	$ 3.64
Weighted Average Exercise Price Per Share , Options Granted	$ 5.59
Weighted Average Exercise Price Per Share, Options Exercised	$ 2.88
Weighted Average Exercise Price Per Share, Options Cancelled or forfeited	$ 5.54
Weighted Average Exercise Price Per Share, Ending Balance	$ 3.92
Aggregate Intrinsic Value, Beginning Balance
Aggregate Intrinsic Value, Ending Balance	$ 2,706