Quarterly report pursuant to Section 13 or 15(d)

8. Accrued liabilities (Details)

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8. Accrued liabilities (Details) - USD ($)
$ in Thousands
Jul. 01, 2017
Dec. 31, 2016
Payables and Accruals [Abstract]    
Sales tax estimates, including interest $ 4,573 $ 4,203
Compensation and benefits 1,147 2,431
Accrued incentive and rebate checks 471 358
Accrued rent 242 263
Warranty 42 26
Accrued payables 1,196 570
Deferred revenue 350 227
Other 586 810
Accrued expenses, current $ 8,607 $ 8,888