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Balance Sheet Components (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 30, 2012
--- | --- | ---
Inventories: |  |
Raw materials | $ 28 | $ 32
Work-in-process | 2,165 | 2,599
Finished goods | 332 | 397
Inventories | 2,525 | 3,028
Other current assets: |  |
Prepaid expenses | 815 | 954
Other | 31 | 32
Other current assets | 846 | 986
Accrued liabilities: |  |
Employee related accruals | 1,075 | 1,035
Other | 214 | 179
Accrued liabilities | $ 1,289 | $ 1,214

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