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Goodwill and Intangible Assets (Tables) | 6 Months Ended
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Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Summary of Goodwill and Intangible Assets | Goodwill and intangible assets consisted of:
|  | As of
|  | June 30, 2021 |  | December 31, 2020
(in thousands) |  | Useful life (months) |  | Gross carrying amount |  | Accumulated amortization |  | Net carrying amount |  | Gross carrying amount |  | Accumulated amortization |  | Net carrying amount
Customer relationships |  | 120 |  | $ | 25,040 |  |  | $ | (11,373) |  |  | $ | 13,667 |  |  | $ | 25,040 |  |  | $ | (10,016) |  |  | $ | 15,024 |
Non-compete agreements |  | 60 |  | 303 |  |  | (240) |  |  | 63 |  |  | 303 |  |  | (211) |  |  | 92 |
Domain names |  | 60 |  | 1,224 |  |  | (895) |  |  | 329 |  |  | 1,224 |  |  | (789) |  |  | 435 |
Intangible assets |  |  |  | $ | 26,567 |  |  | $ | (12,508) |  |  | $ | 14,059 |  |  | $ | 26,567 |  |  | $ | (11,016) |  |  | $ | 15,551 |
Goodwill |  | Indefinite |  | $ | 18,402 |  |  | — |  |  | $ | 18,402 |  |  | $ | 18,402 |  |  | — |  |  | $ | 18,402 |
Summary of Change in Goodwill and Intangible Assets | The following table presents the changes in goodwill and intangible assets:
|  | As of
|  | June 30, 2021 |  | December 31, 2020
(in thousands) |  | Goodwill |  | Intangible assets |  | Goodwill |  | Intangible assets
Beginning balance |  | $ | 18,402 |  |  | $ | 15,551 |  |  | $ | 18,402 |  |  | $ | 18,752 |
Additions to goodwill and intangible assets |  | — |  | — |  | — |  | —
Amortization |  | — |  | (1,492) |  |  | — |  | (3,201) |
Ending balance |  | $ | 18,402 |  |  | $ | 14,059 |  |  | $ | 18,402 |  |  | $ | 15,551 |
Summary of Future Amortization Expense on Identifiable Intangible Assets | As of June 30, 2021, future amortization expense relating to identifiable intangible assets with estimable useful lives over the next five years was as follows:
(in thousands) |  | Amortization expense
2021–Remaining Period |  | $ | 1,491 |
2022 |  | 2,730 |
2023 |  | 2,388 |
2024 |  | 2,211 |
2025 |  | 2,028 |
Thereafter |  | 3,211 |
|  | $ | 14,059 |

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