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Intangible Asset and Goodwill (Tables) | 6 Months Ended
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Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of changes in carrying amount of goodwill by reporting unit | The following tables present goodwill information for each of the reportable segments for the six months ended June 30, 2018:
Reportable Segment: |  | As of December 31, 2017 |  | Effect of Exchange Rates (1) |  | As of June 30, 2018
|  | (In thousands)
MID |  | $ | 66,643 |  |  | $ | — |  |  | $ | 66,643 |
RSD |  | 143,018 |  |  | (981 | ) |  | 142,037 |
Total |  | $ | 209,661 |  |  | $ | (981 | ) |  | $ | 208,680 |
(1) Effect of exchange rates relates to foreign currency translation adjustments for the period.
|  | As of
|  | June 30, 2018
Reportable Segment: |  | Gross Carrying Amount |  | Accumulated Impairment Losses |  | Net Carrying Amount
|  | (In thousands)
MID |  | $ | 66,643 |  |  | $ | — |  |  | $ | 66,643 |
RSD |  | 142,037 |  |  | — |  |  | 142,037 |
Other |  | 21,770 |  |  | (21,770 | ) |  | — |
Total |  | $ | 230,450 |  |  | $ | (21,770 | ) |  | $ | 208,680 |
Components of intangible assets | The components of the Company’s intangible assets as of June 30, 2018 and December 31, 2017 were as follows:
|  |  | As of June 30, 2018
| Useful Life |  | Gross Carrying Amount (1) |  | Accumulated Amortization |  | Net Carrying Amount
|  |  | (In thousands)
Existing technology | 3 to 10 years |  | $ | 259,465 |  |  | $ | (206,160 | ) |  | $ | 53,305 |
Customer contracts and contractual relationships | 1 to 10 years |  | 68,377 |  |  | (52,342 | ) |  | 16,035 |
Non-compete agreements and trademarks | 3 years |  | 300 |  |  | (300 | ) |  | — |
In-process research and development | Not applicable |  | 1,600 |  |  | — |  |  | 1,600 |
Total intangible assets |  |  | $ | 329,742 |  |  | $ | (258,802 | ) |  | $ | 70,940 |
|  |  | As of December 31, 2017
| Useful Life |  | Gross Carrying Amount (1) |  | Accumulated Amortization |  | Net Carrying Amount
|  |  | (In thousands)
Existing technology | 3 to 10 years |  | $ | 258,008 |  |  | $ | (191,554 | ) |  | $ | 66,454 |
Customer contracts and contractual relationships | 1 to 10 years |  | 68,794 |  |  | (48,626 | ) |  | 20,168 |
Non-compete agreements and trademarks | 3 years |  | 300 |  |  | (300 | ) |  | — |
In-process research and development | Not applicable |  | 5,100 |  |  | — |  |  | 5,100 |
Total intangible assets |  |  | $ | 332,202 |  |  | $ | (240,480 | ) |  | $ | 91,722 |
(1) The change in gross carrying amount reflects the effects of exchange rates during the period.
Estimated future amortization expense of intangible assets | The estimated future amortization of intangible assets as of June 30, 2018 was as follows (amounts in thousands):
Years Ending December 31: | Amount
2018 (remaining 6 months) | $ | 9,886 |
2019 | 20,355 |
2020 | 20,537 |
2021 | 13,185 |
2022 | 2,006 |
Thereafter | 3,371 |
Total amortizable purchased intangible assets | $ | 69,340 |
In-process research and development | 1,600 |
Total intangible assets | $ | 70,940 |

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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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