Intangible Assets

12 Months Ended

Dec. 31, 2017

Intangible Assets, Net (Excluding Goodwill) [Abstract]

Intangible Assets

Intangible Assets

Intangible assets consisted of the following at December 31, 2017 and December 31, 2016 (in thousands, except years):

	At December 31, 2017
	Gross Carrying Value		Accumulated Amortization			Net Carrying Value
Acquired technology and domain name	$	31,090	$	(19,911	)	$	11,179
Customer relationships	6,300		(4,425		)	1,875
Tradenames	4,900		(2,042		)	2,858
Total	$	42,290	$	(26,378	)	$	15,912

	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

Amortization expense by asset type for the years ended December 31, 2017, 2016, and 2015 is shown below (in thousands):

	Year Ended December 31,
	2017		2016		2015
Acquired technology and domain name	$	3,035	$	3,041	$	3,047
Customer relationships	500		673		760
Trade names	327		327		327
Total amortization	$	3,862	$	4,041	$	4,134

Expected amortization expense with respect to intangible assets at December 31, 2017 for each of the five years through December 31, 2022 and thereafter is as follows (in thousands):

Years ended December 31,
2018	$	3,861
2019	3,791
2020	3,787
2021	2,922
2022	327
Thereafter	1,224
Total amortization expense	$	15,912