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Balance Sheet Components (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Jan. 01, 2012
Inventories:    
Raw materials $ 33 $ 52
Work-in-process 2,240 3,261
Finished goods 243 451
Inventories 2,516 3,764
Other current assets:    
Prepaid expenses 916 575
Other 35 38
Other current assets 951 613
Accrued liabilities:    
Employee related accruals 1,619 845
Other 184 273
Accrued liabilities $ 1,803 $ 1,118