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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Jan. 03, 2020
Dec. 28, 2018
Deferred tax assets:    
Allowance for doubtful accounts and sales returns $ 233 $ 252
Inventories 703 560
Accrued vacation 428 387
Accrued other expenses 1,036 1,232
Stock-based compensation 3,455 2,489
Pensions 1,159 884
Depreciation and amortization 162 843
Net operating loss carryforwards 32,251 34,347
Business, foreign, AMT and R and D credit carryforwards 3,164 3,256
Prepaid expenses 272 272
Capitalized R&D 986 968
Operating lease liability 1,309  
Other 5 122
Valuation allowance (37,603) (43,075)
Total deferred tax assets 7,560 2,537
Deferred tax liabilities:    
Foreign tax withholding (1,295) (1,282)
Operating lease ROU assets (1,309)  
Amortization of R&D (805) (759)
Net foreign earnings not permanently reinvested (401) (240)
Total deferred tax liabilities (3,810) (2,281)
Total net deferred tax assets $ 3,750 $ 256