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Goodwill and Intangible Assets | 3 Months Ended
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Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets | Goodwill and Intangible Assets Goodwill was $253.3 million and $213.6 million as of March 31, 2021 and December 31, 2020, respectively. The following table displays the changes in the gross carrying amount of goodwill:
|  | Amount
|  | (in thousands)
Balance at December 31, 2020 |  | $ | 213,601 |
Alcide acquisition |  | 39,723 |
Balance at March 31, 2021 |  | $ | 253,324 |
The following table presents details of our intangible assets, which include acquired identifiable intangible assets and capitalized internal-use software costs:
|  |  | As of March 31, 2021 |  | As of December 31, 2020
| Weighted- Average Life (years) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Book Value |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Book Value
|  |  | (in thousands)
Intangible assets subject to amortization: |  |  |  |  |  |  |  |  |  |  |  |  |
Developed technology | 5.7 |  | $ | 64,855 |  |  | $ | (27,521) |  |  | $ | 37,334 |  |  | $ | 54,455 |  |  | $ | (24,780) |  |  | $ | 29,675 |
Customer relationships | 6.3 |  | 2,700 |  |  | (1,061) |  |  | 1,639 |  |  | 2,700 |  |  | (958) |  |  | 1,742 |
Trade names | 5.4 |  | 1,419 |  |  | (684) |  |  | 735 |  |  | 1,419 |  |  | (639) |  |  | 780 |
Total acquired intangible assets |  |  | 68,974 |  |  | (29,266) |  |  | 39,708 |  |  | 58,574 |  |  | (26,377) |  |  | 32,197 |
Internal-use software | 3.0 |  | 17,760 |  |  | (4,760) |  |  | 13,000 |  |  | 16,002 |  |  | (3,903) |  |  | 12,099 |
Total intangible assets |  |  | $ | 86,734 |  |  | $ | (34,026) |  |  | $ | 52,708 |  |  | $ | 74,576 |  |  | $ | (30,280) |  |  | $ | 44,296 |
Amortization expense was $3.7 million and $2.1 million for the three months ended March 31, 2021 and 2020, respectively. Estimated future amortization expense of the acquired identifiable intangible assets and completed capitalized internal-use software costs as of March 31, 2021 was as follows (in thousands):
2021 (for the remaining nine months) | $ | 10,929 |
2022 | 11,934 |
2023 | 9,048 |
2024 | 5,605 |
2025 | 5,177 |
2026 and thereafter | 2,987 |
Total | $ | 45,680 |
The table above excludes the impact of $7.0 million of capitalized internal-use software costs for projects that have not been completed as of March 31, 2021, and therefore, we have not determined the useful life of the software, nor have all the costs associated with these projects been incurred.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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