Accrued Liabilities (Tables)

9 Months Ended

Sep. 30, 2019

Payables and Accruals [Abstract]

Schedule of Accrued Liabilities

Accrued liabilities consist of the following:

	As of September 30, 2019		As of December 31, 2018
Accrued compensation and benefits	$	13,489	$	17,745
Accrued warranties	2,111		2,571
Professional and legal fees	2,319		2,154
Taxes other than income	2,570		3,550
General services administration contract contingent liability (see Note 15)	11,739		5,267
Other accrued liabilities	3,027		5,040
	$	35,255	$	36,327

Schedule of Activity Related to Accrued Warranties

Activity related to accrued warranties was as follows:

	Nine Months Ended
	September 30, 2019		September 30, 2018
Balance, beginning of period	$	2,571	$	2,628
Provision for warranty expense	2,672		2,888
Fulfillment of warranty obligations	(3,132)		(2,911)
Balance, end of period	$	2,111	$	2,605