Intangible Assets (Tables)

6 Months Ended

Mar. 31, 2013

Intangible Assets [Abstract]

Schedule of finite-lived intangible assets

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

(in thousands)	As of March 31, 2013							As of September 30, 2012
	Gross Assets		Accumulated Amortization			Net Assets		Gross Assets		Accumulated Amortization			Net Assets
Fiber Optics:
Core Technology	$	12,727	$	(11,486	)	$	1,241	$	12,727	$	(11,150	)	$	1,577
Customer Relations	3,511		(2,503		)	1,008		3,511		(2,359		)	1,152
Patents	4,697		(4,440		)	257		4,697		(4,381		)	316
	20,935		(18,429		)	2,506		20,935		(17,890		)	3,045
Photovoltaics:
Patents	1,972		(1,685		)	287		1,972		(1,589		)	383
Total	$	22,907	$	(20,114	)	$	2,793	$	22,907	$	(19,479	)	$	3,428

Schedule of finite-lived intangible assets, future amortization expense

Based on the carrying amount of our intangible assets as of March 31, 2013, the estimated future amortization expense is as follows:

Estimated Future Amortization Expense
(in thousands)
Six months ended September 30, 2013	$	634
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	$	2,793