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Goodwill and Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Summary of Goodwill | The changes in the carrying amount of goodwill were as follows (in thousands):
December 31, 2020 | $ | — |
Acquisition | 34,279 |
September 30, 2021 | $ | 34,279 |
Summary of Intangible Assets | The following table presents the components of net intangible assets (in thousands):
| As of September 30, 2021 |  | As of December 31, 2020
| Weighted Average Useful Life (Years) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Acquired technology | 4 |  | $ | 6,600 |  |  | $ | (275) |  |  | $ | 6,325 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Acquired customer relationships | 10 |  | 300 |  |  | (5) |  |  | 295 |  |  | — |  |  | — |  |  | — |
Acquired trade name | 2 |  | 100 |  |  | (8) |  |  | 92 |  |  | — |  |  | — |  |  | — |
Patents | 10 |  | 2,708 |  |  | (1,227) |  |  | 1,481 |  |  | 2,538 |  |  | (955) |  |  | 1,583 |
Total |  |  | $ | 9,708 |  |  | $ | (1,515) |  |  | $ | 8,193 |  |  | $ | 2,538 |  |  | $ | (955) |  |  | $ | 1,583 |
Schedule of Expected Amortization Expense of Intangible Assets | As of September 30, 2021, expected remaining amortization expense of intangible assets by fiscal year is as follows (in thousands):
Three months ended December 31, 2021 | $ | 541 |
2022 | 2,021 |
2023 | 1,910 |
2024 | 1,867 |
2025 | 1,154 |
2026 | 160 |
Thereafter | 540 |
Total expected amortization expense | $ | 8,193 |

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