Stockholders' Equity (Details 4) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Stock options outstanding, exercisable and expected to vest
Options outstanding, Number of Shares	1,102,842	1,570,543	1,766,401	1,618,066
Options outstanding, Weighted Average Exercise Price	$ 3.97	$ 3.63	$ 3.61	$ 3.65
Options outstanding, Weighted Average Remaining Contractual Life (years)	3 years 7 months 13 days
Options outstanding, Aggregate Intrinsic Value	$ 6,287
Options vested and expected to vest, Number of Shares	1,042,611
Options vested and expected to vest, Weighted Average Exercise Price	$ 3.93
Options vested and expected to vest, Weighted Average Remaining Contractual Life (years)	3 years 5 months 23 days
Options vested and expected to vest, Aggregate Intrinsic Value	5,981
Options exercisable, Number of Shares	701,524
Options exercisable, Weighted Average Exercise Price	$ 3.69
Options exercisable, Weighted Average Remaining Contractual Life (years)	2 years 3 months 29 days
Options exercisable, Aggregate Intrinsic Value	$ 4,196