Accrued Liabilities

6 Months Ended

Jun. 30, 2019

Payables and Accruals [Abstract]

Accrued Liabilities

ACCRUED LIABILITIES

Accrued liabilities consist of the following:

	As of June 30, 2019		As of December 31, 2018
Accrued compensation and benefits	$	15,094	$	17,745
Accrued warranties	2,444		2,571
Professional and legal fees	2,335		2,154
Taxes other than income	2,803		3,550
General services administration contract contingent liability (see Note 16)	11,594		5,267
Other accrued liabilities	3,595		5,040
	$	37,865	$	36,327

Activity related to accrued warranties was as follows:

	Six Months Ended
	June 30, 2019			June 30, 2018
Balance, beginning of period	$	2,571		$	2,628
Provision for warranty expense	1,855			1,980
Fulfillment of warranty obligations	(1,982		)	(2,046		)
Balance, end of period	$	2,444		$	2,562