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Balance Sheet Components (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 30, 2012
Inventories:    
Raw materials $ 20 $ 32
Work-in-process 1,907 2,599
Finished goods 1,676 397
Inventories 3,603 3,028
Other current assets:    
Prepaid expenses 865 954
Other 56 32
Other current assets 921 986
Accrued liabilities:    
Employee related accruals 1,482 1,035
Other 570 179
Accrued liabilities $ 2,052 $ 1,214