Property and Equipment, Net

9 Months Ended

Sep. 30, 2017

Property, Plant and Equipment [Abstract]

Property and equipment consists of the following:



	September 30,			December 31,
	2017			2016
	(in thousands)
Computer equipment	$	70,158		$	57,295
Computer software	20,254			19,716
Furniture, fixtures and equipment	4,025			3,425
Scanner appliances	14,419			14,776
Leasehold improvements	15,538			3,694
Total property and equipment	124,394			98,906
Less: accumulated depreciation and amortization	(73,113		)	(59,505		)
Property and equipment, net	$	51,281		$	39,401

Physical scanner appliances and other computer equipment that are or will be subject to subscriptions by customers had a net carrying value of $7.7 million and $8.3 million at September 30, 2017 and December 31, 2016, respectively, including assets that have not been placed in service of $1.7 million and $1.3 million, respectively. Depreciation and amortization expense relating to property and equipment was $5.1 million and $4.4 million for the three months ended September 30, 2017 and 2016, respectively, and $14.7 million and $12.0 million for the nine months ended September 30, 2017 and 2016.