Intangible Assets

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



(in thousands)	As of September 30, 2014							As of September 30, 2013
	Gross Assets		Accumulated Amortization			Net Assets		Gross Assets		Accumulated Amortization			Net Assets
Fiber Optics:
Core Technology	$	12,727	$	(12,243	)	$	484	$	12,727	$	(11,822	)	$	905
Customer Relations	3,511		(2,935		)	576		3,511		(2,647		)	864
Patents	4,697		(4,615		)	82		4,697		(4,498		)	199
	20,935		(19,793		)	1,142		20,935		(18,967		)	1,968
Photovoltaics:
Patents	1,528		(1,528		)	—		1,972		(1,781		)	191
Total	$	22,463	$	(21,321	)	$	1,142	$	22,907	$	(20,748	)	$	2,159

Amortization expense related to intangible assets is included in selling, general, and administrative expense on our statement of operations and comprehensive (loss) income. Based on the carrying amount of our intangible assets as of September 30, 2014, the estimated future amortization expense is as follows:



Estimated Future Amortization Expense
(in thousands)

Fiscal year ended September 30, 2015	$	555
Fiscal year ended September 30, 2016	554
Fiscal year ended September 30, 2017	33
Fiscal year ended September 30, 2018	—
Fiscal year ended September 30, 2019 and thereafter	—
Total	$	1,142

Impairment Testing

The impairment tests for our long-lived assets involves comparing fair value to the carrying amount. If the carrying value of the long-lived assets (asset group) exceeds the estimated undiscounted cash flows expected to be generated by the assets, an impairment may exist. We derive fair value using both the guideline public company valuation method, and on a lesser extent, the discounted cash flow valuation method. The guideline public company valuation method entails a comparison to publicly traded companies within similar industry, product lines, market, growth, margins and risk and is generally based on published data regarding the public companies' stock price, revenue, and earnings. The discounted cash flow valuation method is based on both undiscounted and discounted cash flow models using assumptions about revenue growth rates, appropriate discount rates relative to risk, and estimates of terminal value.

Fiscal 2012:

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 had on our operations. See Note 11 - Impact from Thailand Flood 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.

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.

Fiscal 2013

As of September 30, 2013, we performed an impairment test on certain long-lived assets related to our Fiber Optics segment. The impairment test was triggered by a change in long-term financial and cash flow forecasts. The impairment testing indicated that no impairment existed and that future undiscounted cash flows exceeded the carrying value.

Fiscal 2014

As of September 30, 2014, we performed an impairment test on long-lived assets related to our Fiber Optics segment. The impairment test was triggered by a change in long-term financial and cash flow forecasts. The impairment testing indicated that no impairment existed and that future undiscounted cash flows exceeded the carrying value.

The Company will reassess its long-lived assets for impairment whenever events or changes in circumstances indicate that its carrying amount may not be recoverable.