Goodwill and Other Intangible Assets



	Weighted Average Life at 10/31/2018	October 31, 2018										January 31, 2018
	Weighted Average Life at 10/31/2018	Gross Carrying Amount		Accumulated Amortization			Impairment			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Impairment			Net Carrying Amount
				(in thousands)										(in thousands)
Goodwill		$	7,060	$	—		$	(4,529	)	$	2,531	$	7,060	$	—		$	(4,529	)	$	2,531
Proprietary rights	7.6	$	9,594	$	(4,077	)	$	—		$	5,517	$	6,181	$	(3,663	)	$	—		$	2,518
Customer relationships	3.1	5,024		(2,976		)	—			2,048		5,024		(2,464		)	—			2,560
Patents	5.7	2,441		(965		)	—			1,476		1,730		(778		)	—			952
Trade name	7.6	894		(49		)	—			845		894		(41		)	—			853
Developed technology	7.2	1,430		(405		)	—			1,025		1,430		(298		)	—			1,132
Amortizable intangible assets		$	19,383	$	(8,472	)	$	—		$	10,911	$	15,259	$	(7,244	)	$	—		$	8,015

On January 31, 2018, the Company completed an annual review of goodwill and other intangible assets. Based on a review of qualitative factors it was determined it was more likely than not that the fair value of our Seamap reporting unit was greater than its carrying value. Based on a review of qualitative and quantitative factors it was determined it was more likely than not that the fair value of our Klein reporting unit was not greater than its carrying value. Accordingly, we recorded an impairment of approximately $1.5 million related to the Klein reporting unit in the quarter ended January 31, 2018.

During the nine months ended October 31, 2018 there have been no substantive indicators of additional impairment.

Amortizable intangible assets are amortized over their estimated useful lives of five to 15 years using the straight-line method. Aggregate amortization expense was $1.3 million and $1.1 million for the nine months ended October 31, 2018 and 2017, respectively. As of October 31, 2018, future estimated amortization expense related to amortizable intangible assets was estimated to be:



For fiscal years ending January 31 (in thousands):
2019	$	472
2020	1,845
2021	1,697
2022	1,212
2023	1,018
2024 and thereafter	4,667
Total	$	10,911