7. INTANGIBLE ASSETS

Intangible assets consisted of the following items as of the dates indicated (in thousands):

	September 30, 2013							December 31, 2012
	Gross					Net		Gross					Net
	Carrying		Accumulated			Carrying		Carrying		Accumulated			Carrying
	Amount		Amortization			Amount		Amount		Amortization			Amount
Trade name/ trademark	$	11,807	$	(83	)	$	11,724	$	10,607	$	—		$	10,607
Core technology	9,953		(2,891		)	7,062		2,453		(2,453		)	—
Customer relationships	22,151		(11,324		)	10,827		10,850		(10,850		)	—
Website	12		(12		)	—		12		(12		)	—
Patents	300		(112		)	188		300		(82		)	218
Total	$	44,223	$	(14,422	)	$	29,801	$	24,222	$	(13,397	)	$	10,825

The intangible assets recorded as a result of the Livemocha acquisition are included in the September 30, 2013 balances. The acquired amortizable intangible assets and the related estimated useful lives consist of the following (in thousands):

	Preliminary Estimated Useful Lives	Preliminary Estimated Value April 1, 2013
Online community	3 years	$	1,800
Customer relationships	5 years	100
Technology platform	5 years	3,400
Tradename	2 years	200
Total assets		$	5,500

The intangible assets recorded as a result of the Lexia acquisition are included in the September 30, 2013 balances. The acquired amortizable intangible assets and the related estimated useful lives consist of the following (in thousands):

	Preliminary Estimated Useful Lives	Preliminary Estimated Value August 1, 2013
Customer relationships	10 years	$	9,400
Technology platform	7 years	4,100
Tradename	5 years	1,000
Total assets		$	14,500

Amortization of intangible assets for the three months ended September 30, 2013 and 2012 totaled $652,000 and $10,000, respectively. For the three months ended September 30, 2013 and 2012, $180,000 and $10,000 was included in research and development expense $374,000 and zero was included in sales and marketing expense and $98,000 and zero were included in cost of service. The increase in amortization expense is due to the amortization of the intangible assets recorded as a result of the Livemocha and Lexia acquisitions.

Amortization of intangible assets for the nine months ended September 30, 2013 and 2012 totaled $1,025,000 and $30,000, respectively. For the nine months ended September 30, 2013 and 2012, $370,000 and $30,000 was included in research and development expense, $557,000 and zero was included in sales and marketing expense and $98,000 and zero were included in cost of service. The increase in amortization expense is due to the amortization of the intangible assets recorded as a result of the Livemocha and Lexia acquisitions.

The following table summarizes the estimated future amortization expense related to intangible assets for the remaining nine months of 2013 and years thereafter (in thousands):

2013—remaining	$	795
2014	3,171
2015	3,087
2016	2,605
2017	2,453
Thereafter	7,083
Total	$	19,194

In accordance with ASC 350, the Company reviews its indefinite lived intangible assets annually as of December 31. There were no impairment charges for the nine months ended September 30, 2013 or September 30, 2012.