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Intangible Assets
 9 Months Ended
Jun. 30, 2013
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, 2013
 
As of September 30, 2012
 
 
Gross
Assets
 
Accumulated
Amortization
 
Net
Assets
 
Gross Assets
 
Accumulated
Amortization
 
Net
Assets
Fiber Optics:
 
 
 
 
 
 
 
 
 
 
 
 
   Core Technology
 
$
12,727

 
$
(11,654
)
 
$
1,073

 
$
12,727

 
$
(11,150
)
 
$
1,577

   Customer Relations
 
3,511

 
(2,575
)
 
936

 
3,511

 
(2,359
)
 
1,152

   Patents
 
4,697

 
(4,469
)
 
228

 
4,697

 
(4,381
)
 
316

 
 
20,935

 
(18,698
)
 
2,237

 
20,935

 
(17,890
)
 
3,045

Photovoltaics:
 
 
 
 
 
 
 
 
 
 
 
 
   Patents
 
1,972

 
(1,733
)
 
239

 
1,972

 
(1,589
)
 
383

Total
 
$
22,907

 
$
(20,431
)
 
$
2,476

 
$
22,907

 
$
(19,479
)
 
$
3,428



Amortization expense related to intangible assets is included in sales, general, and administrative expense on our statement of operations and comprehensive income (loss). Based on the carrying amount of our intangible assets as of June 30, 2013, the estimated future amortization expense is as follows:
Estimated Future Amortization Expense
 
(in thousands)
 
Three months ended September 30, 2013
$
317

Fiscal year ended September 30, 2014
1,017

Fiscal year ended September 30, 2015
555

Fiscal year ended September 30, 2016
555

Fiscal year ended September 30, 2017
32

Thereafter
—

Total
$
2,476