Intangible Assets

9 Months Ended

Sep. 30, 2015

Intangible Assets, Net (Excluding Goodwill) [Abstract]

Intangible assets

Intangible Assets

Intangible assets consisted of the following at September 30, 2015 and December 31, 2014 (in thousands):

	At September 30, 2015
	Gross Carrying Value		Accumulated Amortization			Net Carrying Value
Acquired technology and domain name	$	31,090	$	(13,073	)	$	18,017
Customer relationships	6,300		(3,062		)	3,238
Tradenames	4,900		(1,307		)	3,593
Total	$	42,290	$	(17,442	)	$	24,848

	At December 31, 2014
	Gross Carrying Value		Accumulated Amortization			Net Carrying Value
Acquired technology and domain name	$	31,090	$	(10,788	)	$	20,302
Customer relationships	6,300		(2,491		)	3,809
Tradenames	4,900		(1,062		)	3,838
Total	$	42,290	$	(14,341	)	$	27,949

Amortization expense for the three months ended September 30, 2015 and 2014 was $1.0 million and $1.0 million, respectively. For the nine months ended September 30, 2015 and 2014, amortization expense was $3.1 million and $3.2 million, respectively.

Amortization expense with respect to intangible assets at September 30, 2015 for each of the five years through December 31, 2019 and thereafter is as follows (in thousands):

Three months ending December 31, 2015	$	1,033
2016	4,041
2017	3,862
2018	3,861
2019	3,791
Thereafter	8,260
Total amortization expense	$	24,848