Goodwill and Other Intangible Assets



	Weighted Average Life at 7/31/2019	July 31, 2019										January 31, 2019
	Weighted Average Life at 7/31/2019	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	7.5	$	9,295	$	(4,611	)	$	—		$	4,684	$	9,303	$	(4,292	)	$	—		$	5,011
Customer relationships	2.3	5,024		(3,489		)	—			1,535		5,024		(3,147		)	—			1,877
Patents	5.0	2,440		(1,152		)	—			1,288		2,441		(1,028		)	—			1,413
Trade name	6.8	894		(58		)	—			836		894		(52		)	—			842
Developed technology	6.4	1,430		(512		)	—			918		1,430		(441		)	—			989
Other	4.7	692		(44		)	—			648		385		(22		)	—			363
Amortizable intangible assets		$	19,775	$	(9,866	)	$	—		$	9,909	$	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. During the six months ended July 31, 2019 there have been no indicators of impairment.

Aggregate amortization expense was $764,000 and $889,000 for the six months ended July 31, 2019 and 2018, respectively. As of July 31, 2019, future estimated amortization expense related to amortizable intangible assets was estimated to be (in thousands):



For fiscal years ending January 31
2020	$	961
2021	1,775
2022	1,245
2023	1,141
2024	938
Thereafter	3,849
Total	$	9,909