Quarterly report pursuant to Section 13 or 15(d)

13. Accrued liabilities (Details)

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13. Accrued liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Payables and Accruals [Abstract]    
Sales tax estimates, including interest $ 4,610 $ 4,203
Compensation and benefits 741 2,431
Accrued incentive and rebate checks 192 358
Accrued rent 238 263
Warranty 14 26
Accrued payables 0 570
Deferred revenue 322 227
Other 110 810
Accrued expenses, current $ 6,227 $ 8,888