Annual report pursuant to Section 13 and 15(d)

Accrued liabilities (Details)

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Accrued liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Payables and Accruals [Abstract]    
Fixed asset related $ 232 $ 1,330
Payroll related 470 359
Use tax accrual 75 156
Professional services 88 29
Estimated Interstate Battery settlement 600
Other 336 101
Accrued liabilities $ 1,801 $ 1,975