Stockholders' Equity - Restricted Stock Units Outstanding, Vested and Expected to Vest (Details) - Restricted Stock Units (RSUs) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Restricted stock units outstanding, vested and expected to vest
Restricted stock units outstanding, Number of Shares	597,121	361,148	335,805
Restricted stock units outstanding, Weighted Average Remaining Contractual Life (years)	1 year 5 months 8 days
Restricted stock units outstanding, Aggregate Intrinsic Value	$ 2,657
Restricted stock units vested and expected to vest, Number of Shares	492,239
Restricted stock units vested and expected to vest, Weighted Average Remaining Contractual Life (years)	1 year 3 months 29 days
Restricted stock units vested and expected to vest, Aggregate Intrinsic Value	$ 2,190