Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2017

Intangible Assets, Net (Excluding Goodwill) [Abstract]

Schedule of 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

Schedule of amortization expense

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

Schedule of expected amortization expense with respect to intangible assets

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