Intangible Assets Intangible Assets

12 Months Ended

Dec. 31, 2014

Finite-Lived Intangible Assets, Net [Abstract]

INTANGIBLE ASSETS

INTANGIBLE ASSETS

Intangible Assets

The following table sets forth the components of intangible assets as follows (in thousands):

	December 31, 2014							December 31, 2013
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Developed and core technology	$	7,443	$	(1,810	)	$	5,633	$	7,783	$	(986	)	$	6,797
Customer relationships	3,800		(1,181		)	2,619		3,800		(552		)	3,248
Trademarks	610		(370		)	240		610		(284		)	326
Non-competition agreements	—		—			—		450		(372		)	78
In-process research and development	1,300		—			1,300		1,300		—			1,300
	$	13,153	$	(3,361	)	$	9,792	$	13,943	$	(2,194	)	$	11,749

The above intangible assets acquired in connection with the Discera acquisition in 2013 of $2.7 million, PhaseLink acquisition in 2012 of $8.3 million, and other acquired intangible assets of $2.1 million are amortized over their estimated useful lives ranging from one to ten years using the straight-line method. Total intangible amortization expense for the years ended December 31, 2014, 2013 and 2012 was $1.6 million, $1.4 million and $0.8 million, respectively.

The estimated future amortization expense of intangible assets at December 31, 2014 was as follows (in thousands):

Year Ending December 31,
2015	$	1,535
2016	1,510
2017	1,281
2018	1,223
2019	1,140
Thereafter	3,103
	$	9,792

During 2012, the Company recorded an impairment of $1.0 million as a component of research and development expense for purchased technology which was replaced by more advanced technologies.