Quarterly report pursuant to Section 13 or 15(d)

9. Accrued Expenses (Details)

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9. Accrued Expenses (Details) - USD ($)
$ in Thousands
Apr. 01, 2017
Dec. 31, 2016
Apr. 02, 2016
Jan. 02, 2016
Payables and Accruals [Abstract]        
Sales tax estimates, including interest $ 4,839 $ 4,203    
Compensation and benefits 1,713 2,431    
Accrued incentive and rebate checks 1 358    
Accrued rent 244 263    
Warranty 22 26 $ 26 $ 42
Accrued payables 859 570    
Deferred revenue 357 227    
Other 847 810    
Accrued expenses, current $ 8,882 $ 8,888