Accrued Liabilities and Deferred Revenue (Tables)

6 Months Ended

Jun. 30, 2015

Accrued liabilities are comprised of the following (in thousands):

	June 30,		December 31,
	2015		2014
Payroll and benefits	$	2,384	$	1,905
Warranty accrual, current portion		1,129		930
Taxes		339		139
Accrued professional services		1,672		1,581
Accrued capital lease payments		157		—
Accrued insurance premium		53		450
Other		179		183
Total accrued liabilities	$	5,913	$	5,188

Changes in Initial Product Warranty Accrual and Expenses Under Initial and Extended Warranties

Changes in the initial product warranty accrual, and the expenses incurred under the Company’s initial and extended warranties, for the three and six months ended June 30, 2015 and 2014 were as follows (in thousands):

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2015			2014			2015			2014
Initial warranty accrual, beginning balance	$	1,667		$	1,025		$	1,449		$	1,096
Provision for estimated warranty cost		545			461			996			609
Warranty expenditures		(215	)		(231	)		(448	)		(450	)
		1,997			1,255			1,997			1,255
Less warranty accrual, long-term		868			247			868			247
Total warranty accrual, current portion	$	1,129		$	1,008		$	1,129		$	1,008

Components of Current Portion of Deferred Revenue

Current portion of deferred revenue is comprised of the following (in thousands):

	June 30,		December 31,
	2015		2014
Undelivered elements (training, installation, and product and support services)	$	1,636	$	952
Extended warranty contracts		1,414		1,542
Deferred revenue, current portion	$	3,050	$	2,494