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Balance Sheet Components | 12 Months Ended
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Dec. 31, 2022
Balance Sheet Components [Abstract] |
Balance Sheet Components | Balance Sheet Components Marketable Securities Marketable securities consisted of the following (in thousands):
December 31, 2022 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
U.S. treasuries | $ | 25,498 |  |  | $ | — |  |  | $ | (479) |  |  | $ | 25,019 |
Commercial paper | 24,893 |  |  | — |  |  | (53) |  |  | 24,840 |
Corporate bonds | 68,845 |  |  | — |  |  | (1,449) |  |  | 67,396 |
Certificate of deposit | 720 |  |  | — |  |  | (14) |  |  | 706 |
U.S. agency securities | 11,295 |  |  | — |  |  | (250) |  |  | 11,045 |
| $ | 131,251 |  |  | $ | — |  |  | $ | (2,245) |  |  | $ | 129,006 |
December 25, 2021 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
U.S. treasuries | $ | 39,128 |  |  | $ | — |  |  | $ | (143) |  |  | $ | 38,985 |
Commercial paper | 32,174 |  |  | — |  |  | (13) |  |  | 32,161 |
Corporate bonds | 52,832 |  |  | 29 |  |  | (151) |  |  | 52,710 |
Certificate of deposit | 1,200 |  |  | 1 |  |  | (2) |  |  | 1,199 |
| $ | 125,334 |  |  | $ | 30 |  |  | $ | (309) |  |  | $ | 125,055 |
We typically invest in highly-rated securities with low probabilities of default. Our investment policy requires investments to be rated single A or better, limits the types of acceptable investments, concentration as to security holder and duration of the investment. The gross unrealized gains and losses in fiscal 2022 and 2021 were caused primarily by changes in interest rates. The longer the duration of marketable securities, the more susceptible they are to changes in market interest rates and bond yields. As yields increase, those securities with a lower yield-at-cost show a mark-to-market unrealized loss. We anticipate recovering the full cost of the securities either as market conditions improve or as the securities mature. Accordingly, we believe that the unrealized losses are not as a result of a credit loss. The contractual maturities of marketable securities were as follows (in thousands):
| December 31, 2022 |  | December 25, 2021
| Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
Due in one year or less | $ | 77,663 |  |  | $ | 76,902 |  |  | $ | 75,804 |  |  | $ | 75,778 |
Due after one year to five years | 53,588 |  |  | 52,104 |  |  | 49,530 |  |  | 49,277 |
| $ | 131,251 |  |  | $ | 129,006 |  |  | $ | 125,334 |  |  | $ | 125,055 |
See also Note 9, Fair Value. Inventories, net Inventories consisted of the following (in thousands):
| December 31, 2022 |  | December 25, 2021
Raw materials | $ | 55,726 |  |  | $ | 57,673 |
Work-in-progress | 46,067 |  |  | 35,935 |
Finished goods | 21,364 |  |  | 17,940 |
| $ | 123,157 |  |  | $ | 111,548 |
Property, Plant and Equipment, net Property, plant and equipment, net consisted of the following (in thousands):
| December 31, 2022 |  | December 25, 2021
Land | $ | 17,136 |  |  | $ | 4,751 |
Building and building improvements | 44,932 |  |  | 41,722 |
Machinery and equipment | 276,180 |  |  | 252,632 |
Computer equipment and software | 45,813 |  |  | 44,667 |
Furniture and fixtures | 7,540 |  |  | 7,293 |
Leasehold improvements | 86,500 |  |  | 82,266 |
Sub-total | 478,101 |  |  | 433,331 |
Less: Accumulated depreciation and amortization | (335,711) |  |  | (312,700) |
Net property, plant and equipment | 142,390 |  |  | 120,631 |
Construction-in-progress | 47,458 |  |  | 25,924 |
Total | $ | 189,848 |  |  | $ | 146,555 |
Accrued Liabilities Accrued liabilities consisted of the following (in thousands):
| December 31, 2022 |  | December 25, 2021
Accrued compensation and benefits | $ | 15,864 |  |  | $ | 29,706 |
Accrued income and other taxes | 12,817 |  |  | 8,086 |
Accrued employee stock purchase plan contributions withheld | 4,585 |  |  | 4,693 |
Accrued warranty | 4,199 |  |  | 2,805 |
Accrued restructuring charges | 1,249 |  |  | 2,478 |
Other accrued expenses | 3,401 |  |  | 3,068 |
| $ | 42,115 |  |  | $ | 50,836 |

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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI https://asc.fasb.org/topic&trid=2122208 + Details
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