Intangible Assets

The following table sets forth the carrying value of intangible assets by reporting segment:



(in thousands)	As of June 30, 2012							As of September 30, 2011
	Gross Assets		Accumulated Amortization			Net Assets		Gross Assets		Accumulated Amortization			Net Assets
Fiber Optics:
Core Technology	$	12,727	$	(10,982	)	$	1,745	$	13,872	$	(10,862	)	$	3,010
Customer Relations	3,511		(2,287		)	1,224		3,511		(2,071		)	1,440
Patents	4,697		(4,352		)	345		4,697		(4,265		)	432
	20,935		(17,621		)	3,314		22,080		(17,198		)	4,882
Photovoltaics:
Patents	1,972		(1,541		)	431		2,279		(1,295		)	984
Total	$	22,907	$	(19,162	)	$	3,745	$	24,359	$	(18,493	)	$	5,866

In May 2012, we sold approximately $0.5 million of fiber optics-related intangible assets, net of accumulated amortization, to SEI pursuant to a Master Purchase Agreement signed in March 2012. See Note 1 - Basis of Presentation for additional disclosures related to this asset sale.

Amortization expense related to intangible assets is included in sales, general, and administrative expense on our statement of operations and comprehensive loss. Based on the carrying amount of our intangible assets as of June 30, 2012, the estimated future amortization expense is as follows:



Estimated Future Amortization Expense
(in thousands)
Three months ended September 30, 2012	$	317
Fiscal year ended September 30, 2013	1,269
Fiscal year ended September 30, 2014	1,017
Fiscal year ended September 30, 2015	555
Fiscal year ended September 30, 2016	555
Thereafter	32
Total	$	3,745

Impairment Testing

As of December 31, 2011, we performed an impairment test of long-lived assets within our Fiber Optics segment and we determined that no impairment existed. The impairment test was triggered by a change in long-term financial and cash flow forecasts due to the adverse impact the Thailand flood has had on our operations. See Note 9 - Flood-related Losses for additional disclosures related to the impact of the Thailand flood on our operations. In making this determination, we used certain assumptions, including estimates of future cash flows expected to be generated by these long-lived assets, which are based on additional assumptions such as asset utilization, expected length of service from the assets, and estimated salvage values. If we are unable to achieve projected cash flows, we may be required to perform additional impairment tests of our remaining long-lived assets which may result in the recording of impairment charges.

As of June 30, 2012, we performed an evaluation of an asset group within our Photovoltaics segment for impairment of long-lived assets. The impairment test was triggered by a determination that it was more likely than not those assets would be sold or otherwise disposed of before the end of their previously estimated useful lives. As a result of the evaluation, we determined that impairment existed and a charge of $1.4 million was recorded to write down the long-lived assets to an estimated fair value. Of the total impairment charge, $1.1 million related to equipment and $0.3 million related to intangible assets. See Note 15 - Subsequent Events for disclosures related to the recently signed definitive agreement which will consolidate the Company's terrestrial CPV system engineering and development efforts into the Company's joint venture.