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Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 28, 2019
Dec. 29, 2018
Deferred tax assets:    
Operating loss carryforward $ 32,014 $ 29,365
Tax credit carryforwards 3,664 3,578
Reserves and allowances 643 505
Foreign operating loss carryforward 759 925
Stock-based compensation 368 458
Other 672 264
Total deferred tax assets 38,120 35,095
Deferred tax liabilities:    
Operating lease right-of-use assets (261)  
Prepaid expenses (161) (171)
Basis difference in warrant value (106) (191)
Total deferred tax liabilities (528) (362)
Subtotal 37,592 34,733
Valuation allowance (37,592) (34,733)
Deferred Tax Assets, Net, Total