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Balance Sheet Components (Details) - USD ($)
$ in Thousands
Sep. 27, 2015
Dec. 28, 2014
Inventories:    
Raw material $ 0 $ 0
Work-in-process 1,660 1,191
Finished goods 712 3,761
Inventories 2,372 4,952
Other current assets:    
Prepaid expenses 714 1,042
Other 119 104
Other current assets 833 1,146
Property and equipment:    
Property and equipment, gross 17,403 18,684
Accumulated depreciation and amortization (14,840) (15,467)
Property and equipment, net 2,563 3,217
Accrued liabilities:    
Employee related accruals 1,804 1,356
Restructuring accruals - See Note 12 111 0
Other 114 218
Accrued liabilities 2,029 1,574
Equipment    
Property and equipment:    
Property and equipment, gross 13,618 14,047
Software    
Property and equipment:    
Property and equipment, gross 2,941 3,332
Furniture and fixtures    
Property and equipment:    
Property and equipment, gross 131 710
Leasehold improvements    
Property and equipment:    
Property and equipment, gross $ 713 $ 595