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Goodwill and Other Intangible Assets | 12 Months Ended
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Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Other Intangible Assets | 7. Goodwill and Other Intangible Assets Goodwill As of December 31, 2023, changes in the carrying value of goodwill are as follows:
| U.S. Marketplace |  |  | Digital Wholesale |  |  | Other |  |  | Total |
Balance as of December 31, 2022 | $ | 12,477 |  |  | $ | 130,451 |  |  | $ | 14,539 |  |  | $ | 157,467 |
Foreign currency translation adjustment |  | — |  |  |  | — |  |  |  | 431 |  |  |  | 431 |
Balance as of December 31, 2023 | $ | 12,477 |  |  | $ | 130,451 |  |  | $ | 14,970 |  |  | $ | 157,898 |
The Company assessed its goodwill for impairment and did no t identify any impairment as of December 31, 2023. Although no impairment was identified during the annual impairment test as of October 1, 2023, the excess of the fair value over the carrying value declined for the CarOffer reporting unit in the Digital Wholesale segment. If projected future operating results further decline, including as a result of economic conditions or operational challenges, the Company may need to record an impairment charge to reduce its goodwill at CarOffer which could be material and negatively affect the Company's operations. Other Intangible Assets As of December 31, 2023 and 2022, intangible assets consist of the following:
|  | As of December 31, 2023 |
|  | Weighted Average Remaining Useful Life (years) |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Accumulated Impairment |  |  | Net Carrying Amount |
Brand |  |  | 7.4 |  |  | $ | 32,193 |  |  | $ | 10,262 |  |  | $ | — |  |  | $ | 21,931 |
Customer relationships |  |  | 0.0 |  |  |  | 19,870 |  |  |  | 19,620 |  |  |  | — |  |  |  | 250 |
Developed technology |  |  | 0.0 |  |  |  | 65,212 |  |  |  | 63,690 |  |  |  | 647 |  |  |  | 875 |
Total |  |  |  |  | $ | 117,275 |  |  | $ | 93,572 |  |  | $ | 647 |  |  | $ | 23,056 |
|  | As of December 31, 2022 |
|  | Weighted Average Remaining Useful Life (years) |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Accumulated Impairment |  |  | Net Carrying Amount |
Brand |  |  | 8.4 |  |  | $ | 32,129 |  |  | $ | 7,227 |  |  | $ | — |  |  | $ | 24,902 |
Customer relationships |  |  | 1.0 |  |  |  | 19,870 |  |  |  | 13,609 |  |  |  | — |  |  |  | 6,261 |
Developed technology |  |  | 1.0 |  |  |  | 65,212 |  |  |  | 42,674 |  |  |  | 647 |  |  |  | 21,891 |
Total |  |  |  |  | $ | 117,211 |  |  | $ | 63,510 |  |  | $ | 647 |  |  | $ | 53,054 |
For the year ended December 31, 2023, 2022, and 2021, amortization of intangible assets was $30,062, $30,716, and $30,152, respectively. For the year ended December 31, 2021, the Company wrote off $647 of U.S. Marketplace segment intangible assets within marketplace cost of revenue in the consolidated income statements related to certain developed technology which the Company decided to cease investment. As of December 31, 2023, estimated amortization expense of intangible assets for future periods is as follows:
Year Ending December 31, |  | Amortization Expense |
2024 |  |  | 4,162 |
2025 |  |  | 3,037 |
2026 |  |  | 3,037 |
2027 |  |  | 3,037 |
2028 |  |  | 3,037 |
Thereafter |  |  | 6,746 |
Total |  | $ | 23,056 |

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