Accrued Liabilities (Tables)

12 Months Ended

Dec. 31, 2017

Payables and Accruals [Abstract]

Accrued Liabilities Schedule

Accrued liabilities consist of the following:

	As of December 31,
	2017		2016
Accrued compensation and benefits	$	16,144	$	13,649
Accrued warranties	2,628		2,594
Professional and legal fees	1,541		1,775
Taxes other than income	3,787		4,026
Other accrued liabilities	3,262		2,528
	$	27,362	$	24,572

Schedule of Activity Related to Accrued Warranties

Activity related to accrued warranties was as follows:

	Years ended December 31,
	2017			2016			2015
Balance, beginning of year	$	2,594		$	2,309		$	2,719
Provision for warranty expense	4,045			3,544			3,597
Fulfillment of warranty obligations	(4,011		)	(3,259		)	(4,007		)
Balance, end of year	$	2,628		$	2,594		$	2,309