Intangible Assets

12 Months Ended

Dec. 31, 2016

Intangible Assets, Net (Excluding Goodwill) [Abstract]

Intangible Assets

Intangible Assets

Intangible assets consisted of the following at December 31, 2016 and December 31, 2015 (in thousands, except years):

	At December 31, 2016
	Gross Carrying Value		Accumulated Amortization			Net Carrying Value
Acquired technology and domain name	$	31,090	$	(16,876	)	$	14,214
Customer relationships	6,300		(3,925		)	2,375
Tradenames	4,900		(1,715		)	3,185
Total	$	42,290	$	(22,516	)	$	19,774

	At December 31, 2015
	Gross Carrying Value		Accumulated Amortization			Net Carrying Value
Acquired technology and domain name	$	31,090	$	(13,835	)	$	17,255
Customer relationships	6,300		(3,252		)	3,048
Tradenames	4,900		(1,388		)	3,512
Total	$	42,290	$	(18,475	)	$	23,815

Amortization expense by asset type for the years ended December 31, 2016, 2015, and 2014 is shown below (in thousands):

	Year Ended December 31,
	2016		2015		2014
Acquired technology and domain name	$	3,041	$	3,047	$	3,164
Customer relationships	673		760		760
Trade names	327		327		327
Total amortization	$	4,041	$	4,134	$	4,251

Expected amortization expense with respect to intangible assets at December 31, 2016 for each of the five years through December 31, 2021 and thereafter is as follows (in thousands):

Years ended December 31,
2017	$	3,862
2018	3,861
2019	3,791
2020	3,787
2021	2,922
Thereafter	1,551
Total amortization expense	$	19,774