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Goodwill and Intangible Assets | 12 Months Ended
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Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets | Goodwill and Intangible Assets Goodwill consists of the following (in thousands):
| Years Ended December 31,
| 2019 |  | 2018
Beginning balance | $ | 149,524 |  |  | $ | 125,272 |
Additions due to acquisitions | 65,181 |  |  | 24,673 |
Foreign currency translation adjustment | (192 | ) |  | (421 | )
Ending balance | $ | 214,513 |  |  | $ | 149,524 |
Intangible assets as of December 31, 2019 and December 31, 2018 consist of the following (in thousands, except weighted-average amortization period):
| December 31, 2019
| Weighted-Average Amortization Period (in months) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Developed technologies and content library | 66 |  |  | $ | 43,268 |  |  | $ | (18,395 | ) |  | $ | 24,873 |
Customer lists | 47 |  |  | 9,970 |  |  | (8,210 | ) |  | 1,760 |
Trade and domain names | 46 |  |  | 10,873 |  |  | (6,169 | ) |  | 4,704 |
Non-compete agreements | 31 |  |  | 2,018 |  |  | (1,890 | ) |  | 128 |
Indefinite-lived trade name | — |  |  | 3,600 |  |  | — |  |  | 3,600 |
Foreign currency translation adjustment | — |  |  | (398 | ) |  | — |  |  | (398 | )
Total intangible assets | 58 |  |  | $ | 69,331 |  |  | $ | (34,664 | ) |  | $ | 34,667 |
| December 31, 2018
| Weighted-Average Amortization Period (in months) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Developed technologies and content library | 71 |  |  | $ | 31,667 |  |  | $ | (13,737 | ) |  | $ | 17,930 |
Customer lists | 47 |  |  | 9,970 |  |  | (6,847 | ) |  | 3,123 |
Trade and domain names | 44 |  |  | 6,113 |  |  | (4,863 | ) |  | 1,250 |
Non-compete agreements | 31 |  |  | 2,018 |  |  | (1,735 | ) |  | 283 |
Indefinite-lived trade name | — |  |  | 3,600 |  |  | — |  |  | 3,600 |
Foreign currency translation adjustment | — |  |  | (271 | ) |  | — |  |  | (271 | )
Total intangible assets | 61 |  |  | $ | 53,097 |  |  | $ | (27,182 | ) |  | $ | 25,915 |
During the years ended December 31, 2019, 2018 and 2017, amortization expense related to our acquired intangible assets totaled approximately $7.5 million, $6.5 million and $5.5 million, respectively. As of December 31, 2019, the estimated future amortization expense related to our finite-lived intangible assets is as follows (in thousands):
2020 | $ | 8,947 |
2021 | 7,554 |
2022 | 6,686 |
2023 | 4,557 |
2024 | 2,411 |
Thereafter | 912 |
Total | $ | 31,067 |

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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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