Goodwill and Other Intangible Assets



	Weighted Average Life at 10/31/2019	October 31, 2019										January 31, 2019
	Weighted Average Life at 10/31/2019	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	7.2	$	9,293	$	(4,766	)	$	—		$	4,527	$	9,303	$	(4,292	)	$	—		$	5,011
Customer relationships	2.1	5,024		(3,660		)	—			1,364		5,024		(3,147		)	—			1,877
Patents	4.8	2,440		(1,215		)	—			1,225		2,441		(1,028		)	—			1,413
Trade name	6.6	894		(60		)	—			834		894		(52		)	—			842
Developed technology	6.2	1,430		(548		)	—			882		1,430		(441		)	—			989
Other	4.6	680		(59		)	—			621		385		(22		)	—			363
Amortizable intangible assets		$	19,761	$	(10,308	)	$	—		$	9,453	$	19,477	$	(8,982	)	$	—		$	10,495

On January 31, 2019, 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. The goodwill related to our Klein reporting unit was fully impaired in fiscal 2018. During the nine months ended October 31, 2019 there have been no indicators of impairment.

Aggregate amortization expense was $457,000 and $1.3 million for the nine months ended October 31, 2019 and 2018, respectively. As of October 31, 2019, future estimated amortization expense related to amortizable intangible assets was estimated to be (in thousands):



For fiscal years ending January 31
2020	$	498
2021	1,762
2022	1,242
2023	1,138
2024	934
Thereafter	3,879
Total	$	9,453