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Goodwill and Intangible Assets | 6 Months Ended
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Jun. 30, 2020
Goodwill And Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets | 6. Goodwill and Intangible Assets The changes in the carrying amount of goodwill for the six months ended June 30, 2020 were as follows:
| Goodwill |
| (in thousands) |
Balance as of December 31, 2019 | $ | 761,153 |
Goodwill acquired |  | 15,311 |
Foreign currency translation |  | (1,279 | )
Balance as of June 30, 2020 | $ | 775,185 |
Intangible assets consisted of the following:
| June 30, 2020 |
| Weighted- Average Remaining Useful Life - Years |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net |
| (in thousands, except years) |
Domain names |  | 2.1 |  |  | $ | 414 |  |  | $ | 241 |  |  | $ | 173 |
Acquired developed technology |  | 3.1 |  |  |  | 167,988 |  |  |  | 92,715 |  |  |  | 75,273 |
Patents |  | 5.4 |  |  |  | 19,860 |  |  |  | 8,021 |  |  |  | 11,839 |
|  |  |  |  | $ | 188,262 |  |  | $ | 100,977 |  |  | $ | 87,285 |
| December 31, 2019 |
| Weighted- Average Remaining Useful Life - Years |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Net |
| (in thousands except years) |
Domain names |  | 2.6 |  |  | $ | 5,414 |  |  | $ | 5,200 |  |  | $ | 214 |
Trademarks |  | — |  |  |  | 3,072 |  |  |  | 3,072 |  |  |  | — |
Acquired developed technology |  | 3.6 |  |  |  | 175,414 |  |  |  | 95,921 |  |  |  | 79,493 |
Customer relationships |  | — |  |  |  | 2,172 |  |  |  | 2,172 |  |  |  | — |
Patents |  | 5.9 |  |  |  | 19,710 |  |  |  | 7,296 |  |  |  | 12,414 |
|  |  |  |  | $ | 205,782 |  |  | $ | 113,661 |  |  | $ | 92,121 |
Amortization of intangible assets was $7.4 million and $9.0 million for the three months ended June 30, 2020 and 2019, respectively, and $15.4 million and $19.4 million for the six months ended June 30, 2020 and 2019, respectively. As of June 30, 2020, the estimated intangible asset amortization expense for the next five years and thereafter is as follows:
| Estimated Amortization |
| (in thousands) |
Remainder of 2020 | $ | 16,305 |
2021 |  | 27,925 |
2022 |  | 19,222 |
2023 |  | 15,258 |
2024 |  | 6,648 |
Thereafter |  | 1,927 |
Total | $ | 87,285 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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