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Income Taxes (Tables) | 12 Months Ended
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Dec. 26, 2020
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 26, 2020 |  | December 28, 2019 |  | December 29, 2018
United States | $ | 72,950 |  |  | $ | 41,115 |  |  | $ | 20,877 |
Foreign | 12,225 |  |  | 9,948 |  |  | 13,050 |
| $ | 85,175 |  |  | $ | 51,063 |  |  | $ | 33,927 |
Schedule of Components of Provision for Income Taxes | The components of the provision (benefit) for income taxes are as follows (in thousands):
| Fiscal Year Ended
| December 26, 2020 |  | December 28, 2019 |  | December 29, 2018
Current provision: |  |  |  |  |
Federal | $ | 1,799 |  |  | $ | 179 |  |  | $ | 79 |
State | 1,194 |  |  | 2,302 |  |  | 388 |
Foreign | 4,278 |  |  | 4,202 |  |  | 4,687 |
| 7,271 |  |  | 6,683 |  |  | 5,154 |
Deferred provision (benefit): |  |  |  |  |
Federal | 1,472 |  |  | 8,128 |  |  | (72,295) |
State | (267) |  |  | (1,898) |  |  | (2,056) |
Foreign | (1,824) |  |  | (1,196) |  |  | (912) |
| (619) |  |  | 5,034 |  |  | (75,263) |
Total provision (benefit) for income taxes | $ | 6,652 |  |  | $ | 11,717 |  |  | $ | (70,109) |
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 (benefit) from income taxes (in thousands):
| Fiscal Year Ended
| December 26, 2020 |  | December 28, 2019 |  | December 29, 2018
U.S. statutory federal tax rate | $ | 17,887 |  |  | $ | 10,723 |  |  | $ | 7,125 |
State taxes, net of federal benefit | 663 |  |  | 441 |  |  | 778 |
Stock-based compensation | (4,962) |  |  | (911) |  |  | (453) |
Research and development credits | (6,576) |  |  | (6,436) |  |  | (3,213) |
Foreign taxes at rates different than the U.S. | 415 |  |  | 1,454 |  |  | 1,287 |
Other permanent differences | 400 |  |  | (148) |  |  | 152 |
Global intangible low-taxed income | — |  |  | 1,369 |  |  | 1,828 |
Foreign Derived Intangible Income | (3,668) |  |  | — |  |  | — |
Change in valuation allowance | 1,862 |  |  | 2,567 |  |  | (75,803) |
Other | 631 |  |  | 2,658 |  |  | (1,810) |
Total | $ | 6,652 |  |  | $ | 11,717 |  |  | $ | (70,109) |
Schedule of Deferred Tax Assets and Liabilities | Significant deferred tax assets and liabilities consisted of the following (in thousands):
| As of
| December 26, 2020 |  | December 28, 2019
Tax credits | $ | 42,927 |  |  | $ | 44,696 |
Inventory reserve | 13,401 |  |  | 12,350 |
Other reserves and accruals | 9,470 |  |  | 5,852 |
Non-statutory stock options | 2,794 |  |  | 2,982 |
Depreciation and amortization | 20,961 |  |  | 27,758 |
Net operating loss carryforwards | 18,421 |  |  | 21,410 |
Gross deferred tax assets | 107,974 |  |  | 115,048 |
Valuation allowance | (38,466) |  |  | (36,604) |
Total deferred tax assets | 69,508 |  |  | 78,444 |
Acquired intangibles and fixed assets | (8,395) |  |  | (13,997) |
Unrealized investment gains | (106) |  |  | (106) |
Tax on undistributed earnings | (110) |  |  | (75) |
Total deferred tax liabilities | (8,611) |  |  | (14,178) |
Net deferred tax assets | $ | 60,897 |  |  | $ | 64,266 |
Summary of Tax Credit Carryforwards | Tax credits and carryforwards available to us at December 26, 2020 consisted of the following (in thousands):
|  | Amount |  | Latest Expiration Date
Federal research and development tax credit |  | $ | 36,579 |  |  | 2023-2040
Foreign tax credit carryforwards |  | 1,059 |  |  | 2021-2027
California research credits |  | 42,615 |  |  | Indefinite
State net operating loss carryforwards |  | 247,990 |  |  | 2022-Indefinite
Singapore net operating loss carryforwards |  | 7,046 |  |  | Indefinite
Schedule of Unrecognized Tax Benefits | The following table reflects changes in the unrecognized tax benefits (in thousands):
| Fiscal Year Ended
| December 26, 2020 |  | December 28, 2019 |  | December 29, 2018
Unrecognized tax benefit, beginning balance | $ | 28,800 |  |  | $ | 25,224 |  |  | $ | 18,296 |
Additions based on tax positions related to the current year | 3,072 |  |  | 3,679 |  |  | 1,677 |
Additions based on tax positions from prior years | 702 |  |  | — |  |  | 5,332 |
Reductions for tax positions of prior years | — |  |  | (5) |  |  | (7) |
Reductions due to lapse of the applicable statute of limitations | (77) |  |  | (98) |  |  | (74) |
Unrecognized tax benefit, ending balance | $ | 32,497 |  |  | $ | 28,800 |  |  | $ | 25,224 |
Interest and penalties recognized as a component of Provision (benefit) for income taxes | $ | 50 |  |  | $ | 59 |  |  | $ | 71 |
Interest and penalties accrued at period end | 204 |  |  | 212 |  |  | 230 |

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