Property and Equipment

12 Months Ended

Dec. 31, 2015

Property and Equipment

Property and Equipment

3. Property and Equipment

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

	As of		As of
	December 31, 2015		December 31, 2014
Lab equipment and machinery	$	55,649	$	53,412
Leasehold improvements		6,116		5,892
Computer equipment and software		4,263		3,774
Furniture and fixtures		207		197
Construction in progress		1,625		847
Total property and equipment		67,860		64,122
Less accumulated depreciation		(52,125)		(45,016)
Property and equipment, net	$	15,735	$	19,106

As discussed in Note 1, Impairment of Long-Lived Assets, during the years ended December 31, 2015 and 2014, the Company did not record any impairment-related expenses.

The following table presents depreciation expense included in the Consolidated Statement of Operations and includes amortization of leasehold improvements (in thousands):

	Years Ended December 31,
	2015		2014		2013
Depreciation expense	$	7,314	$	10,220	$	8,781