6. Intangibles

Intangible assets consist of the following (in thousands):


	Weighted
	Average
	Remaining		June 30,			June 30,
	Useful Life		2013			2012
Cost of amortizable intangibles:
Purchased technology	0.3 years	$	7,700		$	7,700
Customer relationships	3.3 years		1,900			1,900
Patents	10.75 years		78			78
Total cost of intangibles			9,678			9,678
Less accumulated amortization:
Purchased technology			(7,497	)		(6,772	)
Customer relationships			(1,334	)		(1,161	)
Patents			(13	)		(7	)
Total accumulated amortization			(8,844	)		(7,940	)

Total intangible assets, net		$	834		$	1,738

We recorded $904,000, $904,000, and $899,000 of amortization expense during each of the years ended June 30, 2013, 2012 and 2011, respectively. The estimated amortization expense related to intangible assets for the next five fiscal years is (in thousands):


2014	$	381
2015		179
2016		179
2017		54
2018		6
	$	799