Accrued Liabilities

12 Months Ended

Dec. 31, 2018

Payables and Accruals [Abstract]

Accrued Liabilities

Accrued Liabilities

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

	2018		2017
Accrued salaries, benefits and bonus	$	19,063	$	8,957
Accrued professional, consulting and lobbying fees	4,894		3,870
Accrued warranty expense	898		644
Accrued income and other taxes	4,167		2,558
Other accrued expenses	12,070		7,473
Accrued liabilities	$	41,092	$	23,502