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Balance Sheet Components (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 30, 2018
Inventories:    
Raw materials $ 196  
Work-in-process 2,481 $ 3,120
Finished goods 825 716
Inventories 3,502 3,836
Other current assets:    
Prepaid expenses 1,360 1,483
Other 357 292
Other current assets 1,717 1,775
Property and equipment:    
Property and equipment, gross 13,096 14,149
Less: Accumulated depreciation and amortization (11,986) (12,700)
Property and equipment, net 1,110 1,449
Accrued liabilities:    
Employee related accruals 739 1,154
Other 568 749
Accrued liabilities 1,307 1,903
Equipment    
Property and equipment:    
Property and equipment, gross 10,729 10,607
Software    
Property and equipment:    
Property and equipment, gross 1,823 2,788
Furniture and fixtures    
Property and equipment:    
Property and equipment, gross 55 42
Leasehold improvements    
Property and equipment:    
Property and equipment, gross $ 489 $ 712