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Goodwill and Intangible Assets, net
 12 Months Ended
Jan. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets, net Goodwill and Intangible Assets, net
Goodwill
As of January 31, 2020 and 2019, goodwill was $48.0 million and $18.1 million, respectively. During the year ended January 31, 2020, the Company recorded $29.9 million of goodwill in connection with the Azuqua acquisition that was completed in March 2019. See Note 3 for further details. No goodwill impairments were recorded during the years ended January 31, 2020, 2019 and 2018.
Goodwill balances as of January 31, 2020 and 2019 were as follows (in thousands):
 
Goodwill
Balance at January 31, 2019
$
18,089

Goodwill recorded in connection with Azuqua acquisition
29,934

Balance at January 31, 2020
$
48,023


Intangible Assets, net
Intangible assets consisted of the following (in thousands):  
 
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

 
As of January 31, 2019
 
Gross
 
Accumulated Amortization
 
Write-offs
 
Net
Capitalized internal-use software costs
$
19,838

 
$
(9,969
)
 
$
—

 
$
9,869

Purchased developed technology
4,600

 
(833
)
 
—

 
3,767

Software licenses
1,023

 
(762
)
 
—

 
261

 
$
25,461

 
$
(11,564
)
 
$
—

 
$
13,897



The Company capitalized $5.1 million and $3.4 million of internal-use software costs during the years ended January 31, 2020 and 2019, respectively, which included $1.2 million and $0.5 million of stock-based compensation costs, respectively. Amortization expense of capitalized internal-use software costs totaled $4.9 million, $4.8 million and $2.7 million during the years ended January 31, 2020, 2019 and 2018, respectively. The Company wrote-off an immaterial amount and $1.1 million of previously capitalized costs in the years ended January 31, 2020 and 2018, respectively, as they were not realizable. The charges were recognized in research and development in the consolidated statements of operations.
During the year ended January 31, 2020, the Company recorded $24.2 million of purchased developed technology, of which $15.7 million related to the Azuqua acquisition (see Note 3 for further details), and the remainder was in connection with an asset acquisition in May 2019, whereby the Company recorded $8.5 million of purchased developed technology with an estimated useful life of five years. The remaining weighted-average useful life of all purchased developed technology was 3.9 and 2.5 years as of January 31, 2020, and 2019, respectively.
Amortization expense of intangible assets for the years ended January 31, 2020, 2019 and 2018 was $10.6 million, $5.8 million, and $2.9 million, respectively.
As of January 31, 2020, estimated remaining amortization expense for the intangible assets by fiscal year was as follows (in thousands):
 
Remaining Amortization
2021
11,300

2022
8,403

2023
6,586

2024
5,356

2025
884

Total
$
32,529