Property and Equipment

12 Months Ended

Dec. 31, 2015

Property, Plant and Equipment [Abstract]

Major classes of property and equipment were as follows:



	December 31, 2015			December 31, 2014

	(in thousands)
Purchased software	$	1,706		$	1,651
Computer equipment and network hardware	40,765			24,673
Furniture, fixtures and office equipment	1,959			1,491
Leasehold improvements	3,237			2,994
Gross property and equipment	47,667			30,809
Accumulated depreciation	(22,264		)	(15,613		)
Net property and equipment	$	25,403		$	15,196

Depreciation expense on property and equipment totaled $8.6 million, $6.5 million, and $4.9 million for the years ended December 31, 2015, 2014 and 2013, respectively.

At December 31, 2015, the Company had no property and equipment under capital leases. At December 31, 2014, property and equipment includes property and equipment under capital leases with a cost basis of $0.6 million. Accumulated depreciation on property and equipment under capital leases at December 31, 2014 was $0.5 million.

Depreciation expense on property and equipment under capital leases was zero, $0.3 million and $0.5 million for the years ended December 31, 2015, 2014 and 2013, respectively.

There were no impairment charges to property and equipment for the years ended December 31, 2015, 2014, and 2013.