Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 26, 2020	Dec. 31, 2019
Deferred Tax Assets:
Reserves and accruals	$ 13,874	$ 8,254
Deferred revenue	1,648	1,219
Share-based compensation	2,556	2,955
Tax credit carryforward	10,801	11,307
Net operating losses	4,849	6,008
Depreciation and amortization	687	946
Operating lease liabilities	4,261	4,965
Other	1,877	772
Gross deferred tax assets	40,553	36,426
Less: valuation allowance	(14,238)	(14,160)
Total deferred tax assets after valuation allowance	26,315	22,266
Deferred Tax Liabilities:
Depreciation and amortization	(75,608)	(83,082)
Operating lease right-of-use assets	(3,960)	(4,709)
Other	(135)	(59)
Gross deferred tax liabilities	(79,703)	(87,850)
Net deferred tax liabilities	$ (53,388)	$ (65,584)