Intangible and Other Assets (Tables)

12 Months Ended

Dec. 31, 2014

Summary of Intangible Assets

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

	Weighted Average Life	2014				2013
		Gross Amount		Accumulated Amortization		Gross Amount		Accumulated Amortization
Intangibles:
Patents and licenses, software and hardware designs	6 years	$	4,222	$	2,171	$	3,620	$	1,461
Developed technology	10 years		2,782		1,461		2,782		1,182
Customer relationships and non-compete	9 years		2,838		1,753		2,838		1,428
Trademark	Indefinite		833		—		833		—
		$	10,675	$	5,385	$	10,073	$	4,071

Other Assets

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

	2014		2013
Other assets:
Bauxite raw materials:
Inventories	$	9,404	$	9,949
Prepayments		—		474
Other assets		1,041		445
	$	10,445	$	10,868