Annual report pursuant to Section 13 and 15(d)

Accrued liabilities (Details)

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Accrued liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Payables and Accruals [Abstract]    
Fixed asset related $ 218 $ 232
Payroll related 2,115 470
Use tax accrual 2 75
Professional services 159 88
Key man penalty accrual 2,500 0
Estimated Interstate Battery settlement 0 600
Other 202 336
Accrued liabilities $ 5,196 $ 1,801