INTANGIBLES AND OTHER ASSETS

We review our amortizable long-lived assets for impairment annually or whenever events indicate that the carrying amount of the asset (group) may not be recoverable. An impairment loss may be needed if the sum of the future undiscounted cash flows is less than the carrying amount of the asset (group). The amount of the loss would be determined by comparing the fair market value of the asset to the carrying amount of the asset (group).

Long-lived intangible assets as of March 31, 2016 and December 31, 2015 consisted of the following:



	Dollars in Thousands
	March 31, 2016
	Cost		Accumulated Amortization		Net Book Value
Patents	780		72		708
Intellectual property	672		234		438
	$	1,452	$	306	$	1,146



	Dollars in Thousands
	December 31, 2015
	Cost		Accumulated Amortization		Net Book Value
Patents	980		274		706
Intellectual property	671		207		464
	$	1,651	$	481	$	1,170




	Estimated Useful Life
Patents	Life of the patent
Intellectual property	7 years

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

Amortization expense for intangible assets was less than $0.1 million during each of the three months ended March 31, 2016 and 2015. Amortization expense for intangible assets is expected to be $0.1 million for each of the years ending December 31, 2016, 2017, 2018, 2019 and 2020, respectively.