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Goodwill and Intangible Assets, net | 12 Months Ended
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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 |

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