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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract] |
Summary of Goodwill by Segment and Changes in Carrying Amount of Goodwill | A summary of the goodwill by segment and the changes in the carrying amount of goodwill is shown in the following table (in thousands).
|  |  |  |  |  |  |  |  | Project |  |  |  |  |
| Product |  |  | Research |  |  | Consulting |  |  | Total |
Balance at January 1, 2017 | $ | 2,343 |  |  | $ | 70,850 |  |  | $ | — |  |  | $ | 73,193 |
Translation adjustments |  | 95 |  |  |  | 2,881 |  |  |  | — |  |  |  | 2,976 |
Balance at December 31, 2017 |  | 2,438 |  |  |  | 73,731 |  |  |  | — |  |  |  | 76,169 |
Acquisitions |  | 10,178 |  |  |  | — |  |  |  | — |  |  |  | 10,178 |
Translation adjustments |  | (98 | ) |  |  | (1,084 | ) |  |  | — |  |  |  | (1,182 | )
Balance at December 31, 2018 | $ | 12,518 |  |  | $ | 72,647 |  |  | $ | — |  |  | $ | 85,165 |
Summary of Intangible Assets | A summary of Forrester’s intangible assets is as follows (in thousands):
| December 31, 2018 |
| Gross |  |  |  |  |  |  | Net |
| Carrying |  |  | Accumulated |  |  | Carrying |
| Amount |  |  | Amortization |  |  | Amount |
Amortizable intangible assets: |  |  |  |  |  |  |  |  |  |  |
Customer relationships | $ | 32,823 |  |  | $ | 31,604 |  |  | $ | 1,219 |
Technology |  | 3,610 |  |  |  | 295 |  |  |  | 3,315 |
Trade name |  | 443 |  |  |  | 26 |  |  |  | 417 |
Total | $ | 36,876 |  |  | $ | 31,925 |  |  | $ | 4,951 |
| December 31, 2017 |
| Gross |  |  |  |  |  |  | Net |
| Carrying |  |  | Accumulated |  |  | Carrying |
| Amount |  |  | Amortization |  |  | Amount |
Amortizable intangible assets: |  |  |  |  |  |  |  |  |  |  |
Customer relationships | $ | 31,735 |  |  | $ | 31,003 |  |  | $ | 732 |
Research content |  | 1,083 |  |  |  | 1,083 |  |  |  | — |
Total | $ | 32,818 |  |  | $ | 32,086 |  |  | $ | 732 |
Summary of Estimated Intangible Assets Amortization Expense | Estimated intangible asset amortization expense for each of the five succeeding fiscal years is as follows (in thousands):
Year ending December 31, 2019 | $ | 865 |
Year ending December 31, 2020 |  | 865 |
Year ending December 31, 2021 |  | 865 |
Year ending December 31, 2022 |  | 865 |
Year ending December 31, 2023 |  | 693 |
Thereafter |  | 798 |
Total | $ | 4,951 |

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