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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2016
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, 2015 | $ | 2,454 |  |  | $ | 74,229 |  |  | $ | — |  |  | $ | 76,683 |
Translation adjustments |  | (83 | ) |  |  | (2,529 | ) |  |  | — |  |  |  | (2,612 | )
Balance at December 31, 2015 |  | 2,371 |  |  |  | 71,700 |  |  |  | — |  |  |  | 74,071 |
Translation adjustments |  | (28 | ) |  |  | (850 | ) |  |  | — |  |  |  | (878 | )
Balance at December 31, 2016 | $ | 2,343 |  |  | $ | 70,850 |  |  | $ | — |  |  | $ | 73,193 |
Summary of Intangible Assets | A summary of Forrester’s intangible assets is as follows (in thousands):
| December 31, 2016 |
| Gross |  |  |  |  |  |  | Net |
| Carrying |  |  | Accumulated |  |  | Carrying |
| Amount |  |  | Amortization |  |  | Amount |
Amortizable intangible assets: |  |  |  |  |  |  |  |  |  |  |
Customer relationships | $ | 30,998 |  |  | $ | 29,534 |  |  | $ | 1,464 |
Research content |  | 1,083 |  |  |  | 1,083 |  |  |  | — |
Total | $ | 32,081 |  |  | $ | 30,617 |  |  | $ | 1,464 |
| December 31, 2015 |
| Gross |  |  |  |  |  |  | Net |
| Carrying |  |  | Accumulated |  |  | Carrying |
| Amount |  |  | Amortization |  |  | Amount |
Amortizable intangible assets: |  |  |  |  |  |  |  |  |  |  |
Customer relationships | $ | 32,270 |  |  | $ | 29,936 |  |  | $ | 2,334 |
Research content |  | 3,583 |  |  |  | 3,583 |  |  |  | — |
Technology |  | 1,507 |  |  |  | 1,507 |  |  |  | — |
Total | $ | 37,360 |  |  | $ | 35,026 |  |  | $ | 2,334 |
Estimated Amortization Expense Related to Intangible Assets | Estimated amortization expense related to intangible assets that will continue to be amortized is as follows (in thousands):
Year ending December 31, 2017 | $ | 759 |
Year ending December 31, 2018 |  | 705 |
Total | $ | 1,464 |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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