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Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2021
Intangible Assets Net Excluding Goodwill [Abstract] |
Summary of Intangible Assets | Intangible assets consisted of the following:
|  | As of September 30, 2021 |  |  | As of December 31, 2020 |
(In thousands) |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Book Value |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net Book Value |
Customer relationships |  | $ | 20,876 |  |  | $ | (9,483 | ) |  | $ | 11,393 |  |  | $ | 21,123 |  |  | $ | (8,055 | ) |  | $ | 13,068 |
Developed technology |  |  | 8,200 |  |  |  | (3,399 | ) |  |  | 4,801 |  |  |  | 8,200 |  |  |  | (2,546 | ) |  |  | 5,654 |
Licensed technology |  |  | 5,900 |  |  |  | (2,322 | ) |  |  | 3,578 |  |  |  | 5,900 |  |  |  | (1,830 | ) |  |  | 4,070 |
Supplier relationships |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 2,800 |  |  |  | (2,800 | ) |  |  | — |
Licensing agreements |  |  | 560 |  |  |  | (207 | ) |  |  | 353 |  |  |  | 560 |  |  |  | (152 | ) |  |  | 408 |
Patents |  |  | 500 |  |  |  | (346 | ) |  |  | 154 |  |  |  | 500 |  |  |  | (294 | ) |  |  | 206 |
Trade names |  |  | 210 |  |  |  | (198 | ) |  |  | 12 |  |  |  | 210 |  |  |  | (146 | ) |  |  | 64 |
Total |  | $ | 36,246 |  |  | $ | (15,955 | ) |  | $ | 20,291 |  |  | $ | 39,293 |  |  | $ | (15,823 | ) |  | $ | 23,470 |
Estimated Future Amortization Expense Related to Intangible Assets | Estimated future amortization expense of intangible assets was as follows:
|  | As of |
(In thousands) |  | September 30, 2021 |
2021 |  | $ | 984 |
2022 |  |  | 3,479 |
2023 |  |  | 3,327 |
2024 |  |  | 3,233 |
2025 |  |  | 3,027 |
Thereafter |  |  | 6,241 |
Total |  | $ | 20,291 |

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