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Intangible Assets
 9 Months Ended
Jun. 30, 2014
Intangible Assets [Abstract]  
Intangible Assets
Intangible Assets

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

(in thousands)
 
As of June 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

 
$
(12,138
)
 
$
589

 
$
12,727

 
$
(11,822
)
 
$
905

   Customer Relations
 
3,511

 
(2,863
)
 
648

 
3,511

 
(2,647
)
 
864

   Patents
 
4,697

 
(4,586
)
 
111

 
4,697

 
(4,498
)
 
199

 
 
20,935

 
(19,587
)
 
1,348

 
20,935

 
(18,967
)
 
1,968

Photovoltaics:
 
 
 
 
 
 
 
 
 
 
 
 
   Patents
 
1,528

 
(1,480
)
 
48

 
1,972

 
(1,781
)
 
191

Total
 
$
22,463

 
$
(21,067
)
 
$
1,396

 
$
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 June 30, 2014, the estimated future amortization expense is as follows:
Estimated Future Amortization Expense
 
(in thousands)
 
Three months ended September 30, 2014
$
255

Fiscal year ended September 30, 2015
555

Fiscal year ended September 30, 2016
554

Fiscal year ended September 30, 2017
32

Fiscal year ended September 30, 2018 and thereafter
—

Total
$
1,396