Accrued liabilities (Tables)

12 Months Ended

Dec. 31, 2018

Payables and Accruals [Abstract]

Schedule of accrued liabilities

Accrued liabilities consist of the following (in thousands).

	December 31,
	2018		2017
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		—
Estimated Interstate Battery settlement	—		600
Other	202		336
	$	5,196	$	1,801