Accrued Liabilities

12 Months Ended

Dec. 31, 2017

Payables and Accruals [Abstract]

Accrued Liabilities

Accrued Liabilities

Accrued liabilities consisted of the following at December 31 (in thousands):

	2017		2016
Accrued salaries, benefits and bonus	$	8,957	$	6,474
Accrued professional, consulting and lobbying fees	3,870		3,673
Accrued warranty expense	644		780
Accrued income and other taxes	2,558		4,581
Other accrued expenses	7,473		2,740
Accrued liabilities	$	23,502	$	18,248