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Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2012

Intangible assets consist of the following (in thousands):

	September 30, 2012				December 31, 2011
	Gross carrying value		Accumulated amortization		Gross carrying value		Accumulated Amortization
Amortizable intangible assets Patents	$	2,624	$	2,333	$	2,624	$	2,262

Expected amortization expense

Amortization expense related to intangible assets totaled $11,000 and $71,000 for each of the three and nine months ended September 30, 2012 and totaled $53,000 and $159,000 for each of the three and nine months ended September 30, 2011. The aggregate estimated amortization expense for intangible assets remaining as of September 30, 2012 is as follows (in thousands):

2012	$	11
2013		44
2014		44
2015		44
2016		44
over 5 years		104

Total	$	291