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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