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14. Accrued liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 30, 2017
Payables and Accruals [Abstract]    
Sales tax estimates, including interest $ 4,925 $ 4,563
Compensation and benefits 612 1,061
Deferred revenue 0 300
Accrued incentive and rebate checks 53 285
Accrued rent 0 77
Accrued interest 0 115
Accrued payables 0 129
Other 10 31
Accrued liabilities, current $ 5,600 $ 6,561