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Acquisition-related Intangible Assets, Net | 3 Months Ended
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Apr. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Acquisition-related Intangible Assets, Net | Acquisition-related Intangible Assets, Net Acquisition-related intangible assets, net consisted of the following (in thousands):
| April 30, 2018 |  | January 31, 2018
Acquired developed technology | $ | 69,700 |  |  | $ | 69,700 |
Customer relationship assets | 1,000 |  |  | 1,000 |
| 70,700 |  |  | 70,700 |
Less accumulated amortization | (41,554 | ) |  | (36,466 | )
Acquisition-related intangible assets, net | $ | 29,146 |  |  | $ | 34,234 |
Amortization expense related to acquired developed technology and customer relationship assets was $5 million for each of the three month periods ended April 30, 2018 and 2017. As of April 30, 2018, our future estimated amortization expense related to acquired developed technology and customer relationship assets is as follows (in thousands):
Fiscal Period: |
2019 | $ | 14,998 |
2020 | 11,481 |
2021 | 1,517 |
2022 | 1,150 |
Total | $ | 29,146 |

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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