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Goodwill and Other Intangible Assets
 12 Months Ended
Jan. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets
Goodwill and Other Intangible Assets
 
 
Weighted
Average
Life at
1/31/19
 
January 31, 2019
 
January 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
8.4
 
$
9,303

 
$
(4,292
)
 
—

 
5,011

 
$
6,181

 
$
(3,663
)
 
—

 
2,518

Customer relationships
2.8
 
5,024

 
(3,147
)
 
—

 
1,877

 
5,024

 
(2,464
)
 
—

 
2,560

Patents
5.5
 
2,441

 
(1,028
)
 
—

 
1,413

 
1,730

 
(778
)
 
—

 
952

Trade name
7.3
 
894

 
(52
)
 
—

 
842

 
894

 
(41
)
 
—

 
853

Developed technology
6.9
 
1,430

 
(441
)
 
—

 
989

 
1,430

 
(298
)
 
—

 
1,132

Other
4.7
 
385

 
(22
)
 
—

 
363

 
—

 
—

 
—

 
—

Amortizable intangible assets
 
$
19,477

 
$
(8,982
)
 
$
—

 
$
10,495

 
$
15,259

 
$
(7,244
)
 
$
—

 
$
8,015


As of January 31, 2019, the Company completed its annual review of goodwill. Based on a review of qualitative factors it was determined it was more likely than not that the fair value of our Seamap and Klein reporting units were greater than their carrying values.
On January 31, 2018, the Company completed an annual review of goodwill. 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.
Aggregate amortization expense was $1.8 million, $1.5 million and $1.5 million for the fiscal years ended January 31, 2019, 2018 and 2017, respectively. As of January 31, 2019, future estimated amortization expense related to amortizable intangible assets is estimated to be (in thousands):
For fiscal years ending January 31:
 
2020
$
1,861

2021
1,702

2022
1,165

2023
1,067

2024
919

Thereafter
3,781

Total
$
10,495