3.	Intangible and Other Assets

Following is a summary of intangible assets as of December 31:


			2011				2010
	Weighted Average Life		Gross Amount		Accumulated Amortization		Gross Amount		Accumulated Amortization
Intangibles:
Patents and licenses, software and hardware designs		6 years	$	4,225	$	1,661	$	3,562	$	1,144
Developed technology		10 years		2,782		626		2,782		348
Customer relationships and non-compete		9 years		2,838		756		2,838		420
Trademark		Indefinite		833		—		833		—

			$	10,678	$	3,043	$	10,015	$	1,912

Amortization expense for 2011, 2010 and 2009 was $1,131, $1,043 and $560, respectively. Estimated amortization expense for each of the ensuing years through December 31, 2016 is $1,203, $1,136, $1,124, $1,019 and $820, respectively.

Following is a summary of other assets as of December 31:


	2011		2010
Other assets:
Bauxite raw materials:
Inventories	$	23,842	$	—
Prepayments		1,174		1,163
Other assets		826		1,114

	$	25,842	$	2,277

Bauxite raw materials are used in the production of heavyweight ceramic products. As of December 31, 2011 and 2010, the Company has classified as long-term assets those bauxite raw materials inventories and prepayments in the United States that are not expected to be consumed in production during the upcoming twelve month period.