Patents and other intangible assets (Tables)

9 Months Ended

Sep. 30, 2012

Schedule of Patents and Other Intangible Assets

(US$ in thousands)	September 30, 2012			December 31, 2011
Cost
Patents and developed technologies	$	37,300		$	37,683
Trademarks — definite lived (subject to amortization)		624			545
		37,924			38,228
Accumulated amortization
Patents and developed technologies		(30,514	)		(29,611	)
Trademarks — definite lived (subject to amortization)		(410	)		(381	)
Patents and other intangible assets, net	$	7,000		$	8,236