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5. Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Jan. 02, 2016
Payables and Accruals [Abstract]    
Sales tax estimates, including interest $ 4,203 $ 4,804
Compensation and benefits 2,431 1,446
Accrued incentive and rebate checks 358 293
Accrued rent 263 235
Warranty 26 42
Accrued payables 570 749
Deferred revenue 227 413
Other 810 952
Accrued expenses, current $ 8,888 $ 8,934