INTANGIBLES AND OTHER ASSETS

Long-lived intangible assets and other assets consisted of the following:



	Dollars in Thousands
	March 31, 2012						December 31, 2011
	Cost		Accumulated Amortization		Net Book Value		Cost		Accumulated Amortization		Net Book Value
Intangibles—acquired technology	$	6,535	$	1,138	$	5,397	$	6,535	$	911	$	5,624
Intangibles—assay royalties	1,434		256		1,178		1,434		205		1,229
Intangibles—third party payor relationships	367		—		367		367		—		367
Intangibles—tradenames and trademarks	344		61		283		344		49		295
Patents	726		274		452		703		267		436
Intellectual property	20		6		14		20		5		15
	$	9,426	$	1,735	$	7,691	$	9,403	$	1,437	$	7,966




	Estimated Useful Life
Intellectual property	10 years
Patents	7 years
Intangibles—acquired technology	7 – 8 years
Intangibles—third party payor relationships	Indefinite
Intangibles—assay royalties	7 years
Intangibles—tradenames and trademarks	7 years

Other assets include U.S. security deposits and deferred tax assets, net of applicable valuation allowances.

Amortization expense for intangible assets was $0.3 million during each of the three months ended March 31, 2012 and 2011. Amortization expense for intangible assets is expected to be $1.2 million in each of the years 2012 through 2017.