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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 26, 2020
Accounting Policies [Abstract] |
Schedule of Allowance for Doubtful Accounts | Activity related to our allowance for doubtful accounts receivable was as follows (in thousands):
| Fiscal Year Ended
| December 26, 2020 |  | December 28, 2019 |  | December 29, 2018
Balance at beginning of year | $ | 222 |  |  | $ | 185 |  |  | $ | 200 |
Charges (reversals) to costs and expenses | 26 |  |  | 37 |  |  | (15) |
Balance at end of year | $ | 248 |  |  | $ | 222 |  |  | $ | 185 |
Schedules of Concentration of Risk, by Customer | The following customers represented 10% or more of our revenues:
| Fiscal Year Ended
| December 26, 2020 |  | December 28, 2019 |  | December 29, 2018
Intel Corporation | 31.5 | % |  | 25.3 | % |  | 19.0 | %
Samsung Electronics., LTD. | * |  | 11.5 |  |  | *
* Less than 10% of revenues.
Schedule of Product Warranty Liability Reconciliation | A reconciliation of the changes in our warranty liability is as follows (in thousands):
| Fiscal Year Ended
| December 26, 2020 |  | December 28, 2019 |  | December 29, 2018
Balance at beginning of year | $ | 1,942 |  |  | $ | 2,102 |  |  | $ | 3,662 |
Accruals | 5,727 |  |  | 3,881 |  |  | 3,181 |
Settlements | (3,751) |  |  | (4,041) |  |  | (4,741) |
Balance at end of year | $ | 3,918 |  |  | $ | 1,942 |  |  | $ | 2,102 |
Schedule of Calculation of Numerator and Denominator in Earnings Per Share | The following table reconciles the shares used in calculating basic net income per share and diluted net income per share (in thousands):
| Fiscal Year Ended
| December 26, 2020 |  | December 28, 2019 |  | December 29, 2018
Weighted-average shares used in computing basic net income per share | 76,681 |  |  | 74,994 |  |  | 73,482 |
Add potentially dilutive securities | 2,320 |  |  | 2,292 |  |  | 1,700 |
Weighted-average shares used in computing basic and diluted net income per share | 79,001 |  |  | 77,286 |  |  | 75,182 |
Schedule of Accumulated Other Comprehensive Income (Loss) | Accumulated other comprehensive income (loss) ("OCI") includes the following items, the impact of which has been excluded from earnings and reflected as components of stockholders' equity as shown below (in thousands):
| December 26, 2020 |  | December 28, 2019 |
Unrealized losses on available-for-sale marketable securities | $ | (126) |  |  | $ | (352) |  |
Translation adjustments and other | 5,184 |  |  | 53 |  |
Unrealized gains (losses) on derivative instruments | 828 |  |  | (360) |  |
Accumulated other comprehensive income (loss) | $ | 5,886 |  |  | $ | (659) |  |

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- Definition Tabular disclosure of the changes in the guarantor's aggregate product warranty liability, including the beginning balance of the aggregate product warranty liability, the aggregate reductions in that liability for payments made (in cash or in kind) under the warranty, the aggregate changes in the liability for accruals related to product warranties issued during the reporting period, the aggregate changes in the liability for accruals related to preexisting warranties (including adjustments related to changes in estimates), and the ending balance of the aggregate product warranty liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 + Details
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