v3.22.2.2
Intangible Assets
 9 Months Ended
Oct. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Intangible AssetsIntangible assets consisted of the following (in thousands):
As of January 31,As of October 31,
20222022
Intellectual property excluding patents
$2,458$2,458
Patents
950950
3,4083,408
Less accumulated amortization
(533)(594)
$2,875$2,814
Amortization expense related to intangible assets was $154,000 and $20,000 for the three months ended October 31, 2021 and 2022, respectively, and $461,000 and $60,000 for the nine months ended October 31, 2021 and 2022, respectively. Intellectual property excluding patents is considered an indefinite-lived asset due to the fact that it is renewable in perpetuity. The patents were acquired and are being amortized over a weighted-average remaining useful life of approximately 4.5 years.