Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 28, 2019	Dec. 29, 2018
Deferred tax assets:
Net operating loss carryforward	$ 6,457	$ 4,966
Stock compensation	2,167	1,640
Tax intangible assets	1,327	1,444
Reserves and accruals	9,432	5,776
Income tax credits	1,023	1,345
Allowance for doubtful accounts	606	525
Total deferred tax asset	21,012	15,696
Less: valuation allowance	310	193
Net deferred tax asset	20,702	15,503
Deferred tax liabilities:
Prepaids	(690)	(645)
Depreciation and amortization	(37,169)	(29,374)
Total deferred tax liability	(37,859)	(30,019)
Net deferred tax liability	$ (17,157)	$ (14,516)