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Goodwill and Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | 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 |
Schedule of Identifiable Intangible Assets | 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 |
Schedule of Estimated Amortization Expense | 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 |

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