Intangible Assets (Tables)

6 Months Ended

Mar. 31, 2013

Intangible Assets

Summary of intangible assets

September 30, 2012	Gross Amount		Accumulated Amortization			Carrying Amount
Patents	$	8,667	$	(6,891	)	$	1,776
Trademarks	3,800		—			3,800
Non-compete	1,090		(900		)	190
Other	330		(79		)	251
	$	13,887	$	(7,870	)	$	6,017

March 31, 2013	Gross Amount		Accumulated Amortization			Carrying Amount
Patents	$	8,667	$	(7,031	)	$	1,636
Trademarks	3,800		—			3,800
Non-compete	500		(345		)	155
Other	330		(112		)	218
	$	13,297	$	(7,488	)	$	5,809

Schedule of estimate of aggregate amortization expense

Estimate of Aggregate Amortization Expense: Year Ended September 30,
2013 (remainder of fiscal year)	208
2014	416
2015	393
2016	332
2017	279