6.	Property and Equipment

Property and equipment consisted of the following (in thousands):

 

		December 31,
		2012				2013
Computer equipment and software		$	15,617			$	22,276
Office equipment			1,947				3,235
Furniture & fixtures			1,438				3,083
Construction in Progress			1,072				456
Leasehold improvements			1,845				2,967
Total property and equipment			21,919				32,017
Less accumulated depreciation and amortization			(15,343	)			(18,819	)
Property and equipment, net		$	6,576			$	13,198

Depreciation expense for property and equipment was $3.6 million, $4.0 million and $5.2 million for the years ended December 31, 2011, 2012 and 2013.