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Income Taxes - Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 25, 2021	Dec. 26, 2020	Dec. 28, 2019
Income Tax Reconciliation
U.S. statutory federal tax rate	$ 20,685	$ 17,887	$ 10,723
State taxes and credits, net of federal benefit	811	663	441
Stock-based compensation	(6,118)	(4,962)	(911)
Research and development credits	(7,153)	(6,576)	(6,436)
Foreign taxes at rates different than the U.S.	2,286	415	1,454
Other permanent differences	2,043	400	(148)
Global intangible low-taxed income	0	0	1,369
Foreign derived intangible income	(2,486)	(3,668)	0
Change in valuation allowance	2,231	1,862	2,567
Other	2,277	631	2,658
Total provision for income taxes	$ 14,576	$ 6,652	$ 11,717

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