Intangible Assets

Intangible assets consisted of the following:



	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Weighted Average Useful Life
June 30, 2018
Customer relationships	$	171,940	$	(46,505	)	$	125,435	10.7 years
Licensing agreements and patents	1,506		(640		)	866		3.5 years
Completed technologies	62,392		(13,101		)	49,291		8.1 years
Backlog	7,650		(5,338		)	2,312		1.6 years
	$	243,488	$	(65,584	)	$	177,904
June 30, 2017
Customer relationships	$	117,630	$	(31,533	)	$	86,097	10.0 years
Licensing agreements and patents	1,131		(277		)	854		3.7 years
Completed technologies	44,503		(6,079		)	38,424		7.9 years
Backlog	5,430		(1,768		)	3,662		2.0 years
	$	168,694	$	(39,657	)	$	129,037

Estimated future amortization expense for intangible assets remaining at June 30, 2018 is as follows:



	Year Ending June 30,
2019	$	25,372
2020	21,524
2021	20,867
2022	20,771
2023	18,789
Thereafter	70,581
Total future amortization expense	$	177,904

The following table summarizes the preliminary estimated fair value of acquired intangible assets arising as a result of the Themis acquisition. These assets are included in the Company's gross and net carrying amounts as of June 30, 2018.



	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Weighted Average Useful Life
Customer relationships	$	52,600	$	(1,753	)	$	50,847	12.5 years
Completed technologies	17,150		(752		)	16,398		9.5 years
Backlog	1,970		(821		)	1,149		1.0 year
	$	71,720	$	(3,326	)	$	68,394