4. Property and equipment

The following is a summary of property and equipment, at cost less accumulated depreciation and amortization:

	September 30, 2015			December 31, 2014
Leasehold improvements	$	194,344		$	152,627
Construction in progress	76,574			20,104
Computer equipment	11,285			7,909
Software	22,210			17,827
Furniture, fixtures and office equipment	1,771			297

Total property and equipment	306,184			198,764
Less: accumulated depreciation and amortization	(113,275		)	(86,992		)

Total property and equipment, net	$	192,909		$	111,772

Depreciation and amortization expense, which includes depreciation and amortization for property and equipment under capital leases, is allocated as follows in the accompanying condensed consolidated statements of operations:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2015		2014		2015		2014

Network access	$	6,277	$	5,027	$	17,264	$	13,400
Network operations	2,087		1,370		5,916		3,739
Development and technology	1,377		852		3,887		2,331
General and administrative	292		86		832		180

Total depreciation and amortization of property and equipment	$	10,033	$	7,335	$	27,899	$	19,650