Stockholders' Equity - Restricted Stock Units Outstanding, Vested and Expected to Vest (Details) - Restricted Stock Units (RSUs) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Restricted stock units outstanding, vested and expected to vest
Restricted stock units outstanding, Number of Shares	411,133	597,121	361,148
Restricted stock units outstanding, Weighted Average Remaining Contractual Life (years)	1 year 3 months 7 days
Restricted stock units outstanding, Aggregate Intrinsic Value	$ 966
Restricted stock units vested and expected to vest, Number of Shares	350,639
Restricted stock units vested and expected to vest, Weighted Average Remaining Contractual Life (years)	1 year 2 months 15 days
Restricted stock units vested and expected to vest, Aggregate Intrinsic Value	$ 824