Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2016

Intangible Assets, Net (Excluding Goodwill) [Abstract]

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

Schedule of amortization expense

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

Schedule of expected amortization expense with respect to intangible assets

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