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Goodwill and Intangible Assets, net
 3 Months Ended
Apr. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets, net Goodwill and Intangible Assets, net
Goodwill
As of April 30, 2020 and January 31, 2020, goodwill was $48.0 million. No goodwill impairments were recorded during the three months ended April 30, 2020 and 2019.
Intangible Assets, net
Intangible assets consisted of the following (in thousands):  
 
As of April 30, 2020
 
(unaudited)
 
Gross
 
Accumulated Amortization
 
Write-offs
 
Net
Capitalized internal-use software costs
$
26,093

 
$
(16,007
)
 
$
—

 
$
10,086

Purchased developed technology
28,800

 
(7,914
)
 
—

 
20,886

Software licenses
1,112

 
(1,052
)
 
—

 
60

 
$
56,005

 
$
(24,973
)
 
$
—

 
$
31,032

 
As of January 31, 2020
 
Gross
 
Accumulated Amortization
 
Write-offs
 
Net
Capitalized internal-use software costs
$
24,890

 
$
(14,828
)
 
$
(119
)
 
$
9,943

Purchased developed technology
28,800

 
(6,321
)
 
—

 
22,479

Software licenses
1,112

 
(1,005
)
 
—

 
107

 
$
54,802

 
$
(22,154
)
 
$
(119
)
 
$
32,529


The Company capitalized $1.3 million and $0.5 million of internal-use software costs during the three months ended April 30, 2020 and 2019, respectively. Stock-based compensation expense included in the total amounts capitalized was immaterial.
The remaining weighted-average useful life of all purchased developed technology was 3.7 years as of April 30, 2020.
Amortization expense of intangible assets for the three months ended April 30, 2020 and 2019 was $2.8 million and $2.1 million, respectively.