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Income Taxes (Tables) | 12 Months Ended
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Dec. 25, 2021
Income Tax Disclosure [Abstract] |
Schedule of Components of Income Before Income Taxes | The components of income before income taxes were as follows (in thousands):
| Fiscal Year Ended
| December 25, 2021 |  | December 26, 2020 |  | December 28, 2019
United States | $ | 74,298 |  |  | $ | 72,950 |  |  | $ | 41,115 |
Foreign | 24,202 |  |  | 12,225 |  |  | 9,948 |
| $ | 98,500 |  |  | $ | 85,175 |  |  | $ | 51,063 |
Schedule of Components of Provision for Income Taxes | The components of the provision for income taxes are as follows (in thousands):
| Fiscal Year Ended
| December 25, 2021 |  | December 26, 2020 |  | December 28, 2019
Current provision: |  |  |  |  |
Federal | $ | 2,334 |  |  | $ | 1,799 |  |  | $ | 179 |
State | 712 |  |  | 1,194 |  |  | 2,302 |
Foreign | 7,661 |  |  | 4,278 |  |  | 4,202 |
| 10,707 |  |  | 7,271 |  |  | 6,683 |
Deferred provision (benefit): |  |  |  |  |
Federal | 4,651 |  |  | 1,472 |  |  | 8,128 |
State | 522 |  |  | (267) |  |  | (1,898) |
Foreign | (1,304) |  |  | (1,824) |  |  | (1,196) |
| 3,869 |  |  | (619) |  |  | 5,034 |
Total provision for income taxes | $ | 14,576 |  |  | $ | 6,652 |  |  | $ | 11,717 |
Schedule of Effective Income Tax Rate Reconciliation | The following is a reconciliation of the difference between income taxes computed by applying the federal statutory rate of 21% and the provision from income taxes (in thousands):
| Fiscal Year Ended
| December 25, 2021 |  | December 26, 2020 |  | December 28, 2019
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 | — |  |  | — |  |  | 1,369 |
Foreign derived intangible income | (2,486) |  |  | (3,668) |  |  | — |
Change in valuation allowance | 2,231 |  |  | 1,862 |  |  | 2,567 |
Other | 2,277 |  |  | 631 |  |  | 2,658 |
Total | $ | 14,576 |  |  | $ | 6,652 |  |  | $ | 11,717 |
Schedule of Deferred Tax Assets and Liabilities | Significant deferred tax assets and liabilities consisted of the following (in thousands):
| As of |
| December 25, 2021 |  | December 26, 2020 |
Tax credits | $ | 41,650 |  |  | $ | 42,927 |  |
Inventory reserve | 13,691 |  |  | 13,401 |  |
Other reserves and accruals | 8,523 |  |  | 8,610 |  |
Non-statutory stock options | 2,837 |  |  | 2,794 |  |
Lease liability | 6,717 |  |  | 6,934 |  |
Depreciation and amortization | 17,912 |  |  | 20,961 |  |
Net operating loss carryforwards | 18,395 |  |  | 18,421 |  |
Gross deferred tax assets | 109,725 |  |  | 114,048 |  |
Valuation allowance | (40,698) |  |  | (38,466) |  |
Total deferred tax assets | 69,027 |  |  | 75,582 |  |
Right of use asset | (5,910) |  |  | (6,074) |  |
Acquired intangibles and fixed assets | (4,522) |  |  | (8,395) |  |
Unrealized investment gains | (105) |  |  | (106) |  |
Tax on undistributed earnings | (118) |  |  | (110) |  |
Total deferred tax liabilities | (10,655) |  |  | (14,685) |  |
Net deferred tax assets | $ | 58,372 |  |  | $ | 60,897 |  |
Summary of Tax Credit Carryforwards | Tax credits and carryforwards available to us at December 25, 2021 consisted of the following (in thousands):
|  | Amount |  | Latest Expiration Date
Federal research and development tax credit |  | $ | 34,838 |  |  | 2024-2041
Foreign tax credit carryforwards |  | 1,029 |  |  | 2022-2027
California research credits |  | 46,993 |  |  | Indefinite
State net operating loss carryforwards |  | 250,472 |  |  | 2022-Indefinite
Singapore net operating loss carryforwards |  | 6,331 |  |  | Indefinite
Schedule of Unrecognized Tax Benefits | The following table reflects changes in the unrecognized tax benefits (in thousands):
| Fiscal Year Ended
| December 25, 2021 |  | December 26, 2020 |  | December 28, 2019
Unrecognized tax benefit, beginning balance | $ | 32,497 |  |  | $ | 28,800 |  |  | $ | 25,224 |
Additions based on tax positions related to the current year | 3,201 |  |  | 3,072 |  |  | 3,679 |
Additions based on tax positions from prior years | 124 |  |  | 702 |  |  | — |
Reductions for tax positions of prior years | — |  |  | — |  |  | (5) |
Reductions due to lapse of the applicable statute of limitations | (77) |  |  | (77) |  |  | (98) |
Unrecognized tax benefit, ending balance | $ | 35,745 |  |  | $ | 32,497 |  |  | $ | 28,800 |
Interest and penalties recognized as a component of provision for income taxes | $ | 40 |  |  | $ | 50 |  |  | $ | 59 |
Interest and penalties accrued at period end | 188 |  |  | 204 |  |  | 212 |

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