6. Intangibles

Intangible assets consist of the following (in thousands):


	Weighted Average
	Remaining		June 30,			June 30,
	Useful Life		2012			2011
Cost of amortizable intangibles:
Purchased technology	2.3 years	$	7,700		$	7,700
Customer relationships	4.3 years		1,900			1,900
Patents	11.75 years		78			47
Total cost of intangibles			9,678			9,647
Less accumulated amortization:
Purchased technology			(6,772	)		(6,047	)
Customer relationships			(1,161	)		(988	)
Patents			(7	)		(1	)
Total accumulated amortization			(7,940	)		(7,036	)
Total intangible assets, net		$	1,738		$	2,611

We recorded $904,000, $899,000, and $960,000 of amortization expense during each of the years ended June 30, 2012, 2011 and 2010, respectively. The estimated amortization expense related to intangible assets for the next five fiscal years is (in thousands):


Fiscal year:
2013	$	904
2014		381
2015		179
2016		179
2017		54
	$	1,697