Stockholders' Equity - Restricted Stock Units Outstanding, Vested and Expected to Vest (Details) - Restricted Stock Units (RSUs) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
Restricted stock units outstanding, vested and expected to vest
Restricted stock units outstanding, Number of Shares	361,148	335,805	147,589	277,390
Restricted stock units outstanding, Weighted Average Remaining Contractual Life (years)	1 year 5 months 1 day
Restricted stock units outstanding, Aggregate Intrinsic Value	$ 2,752
Restricted stock units vested and expected to vest, Number of Shares	314,234
Restricted stock units vested and expected to vest, Weighted Average Remaining Contractual Life (years)	1 year 1 month 9 days
Restricted stock units vested and expected to vest, Aggregate Intrinsic Value	$ 2,394