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Intangible Assets and Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of goodwill information by reportable units | The following tables present goodwill information for each of the reportable segments for the years ended December 31, 2017 and December 31, 2016:
Reportable Segment: | December 31, 2016 |  | Addition to Goodwill (1) |  | Impairment Charge of Goodwill |  | Effect of Exchange Rates (2) |  | December 31, 2017
| (In thousands)
MID | $ | 66,643 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 66,643 |
RSD | 138,151 |  |  | 803 |  |  | — |  |  | 4,064 |  |  | 143,018 |
Total | $ | 204,794 |  |  | $ | 803 |  |  | $ | — |  |  | $ | 4,064 |  |  | $ | 209,661 |
(1) During the first quarter of 2017, the Company corrected an immaterial error related to an overstatement in prepaids and other current assets that originated in 2016. (2) Effect of exchange rates relates to foreign currency translation adjustments for the period.
| As of December 31, 2017
Reportable Segment: | Gross Carrying Amount |  | Accumulated Impairment Losses |  | Net Carrying Amount
| (In thousands)
MID | $ | 66,643 |  |  | $ | — |  |  | $ | 66,643 |
RSD | 143,018 |  |  | — |  |  | 143,018 |
Other | 21,770 |  |  | (21,770 | ) |  | — |
Total | $ | 231,431 |  |  | $ | (21,770 | ) |  | $ | 209,661 |
Reportable Segment: | December 31, 2015 |  | Addition to Goodwill (1) |  | Impairment Charge of Goodwill |  | Effect of Exchange Rates (2) |  | December 31, 2016
MID | $ | 19,905 |  |  | $ | 46,738 |  |  | $ | — |  |  | $ | — |  |  | $ | 66,643 |
RSD | 96,994 |  |  | 46,903 |  |  | — |  |  | (5,746 | ) |  | 138,151 |
Total | $ | 116,899 |  |  | $ | 93,641 |  |  | $ | — |  |  | $ | (5,746 | ) |  | $ | 204,794 |
(1) The additions to goodwill are a result of the acquisitions of Smart Card Software Limited (“SCS”) during the first quarter of 2016, and Inphi's Memory Interconnect Business and the assets of the Snowbush IP group during the third quarter of 2016. See Note 18, “Acquisitions” for further details. (2) Effect of exchange rates relates to foreign currency translation adjustments for the period.
| As of December 31, 2016
Reportable Segment: | Gross Carrying Amount |  | Accumulated Impairment Losses |  | Net Carrying Amount
MID | $ | 66,643 |  |  | $ | — |  |  | $ | 66,643 |
RSD | 138,151 |  |  | — |  |  | 138,151 |
Other | 21,770 |  |  | (21,770 | ) |  | — |
Total | $ | 226,564 |  |  | $ | (21,770 | ) |  | $ | 204,794 |
Components of intangible assets | The components of the Company’s intangible assets as of December 31, 2017 and December 31, 2016 were as follows:
|  |  | As of December 31, 2017
| Useful Life |  | Gross Carrying Amount |  | 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 |
|  |  | As of December 31, 2016
| Useful Life |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
|  |  | (In thousands)
Existing technology (1) | 3 to 10 years |  | $ | 256,656 |  |  | $ | (156,577 | ) |  | $ | 100,079 |
Customer contracts and contractual relationships (1) | 1 to 10 years |  | 65,109 |  |  | (37,900 | ) |  | 27,209 |
Non-compete agreements and trademarks | 3 years |  | 300 |  |  | (300 | ) |  | — |
In-process research and development (2) | Not applicable |  | 5,100 |  |  | — |  |  | $ | 5,100 |
Total intangible assets |  |  | $ | 327,165 |  |  | $ | (194,777 | ) |  | $ | 132,388 |
(1) Includes intangible assets from the acquisitions of SCS, Inphi's Memory Interconnect Business, and the assets of the Snowbush IP group. See Note 18, “Acquisitions” for further details. (2) Includes intangible assets from the acquisitions of Inphi's Memory Interconnect Business and the assets of the Snowbush IP group. See Note 18, “Acquisitions” for further details. The in-process research and development assets are accounted for as indefinite-lived intangible assets until the underlying projects are completed or abandoned.
Estimated future amortization expense of intangible assets | The estimated future amortization expense of intangible assets as of December 31, 2017 was as follows (amounts in thousands):
Years Ending December 31: | Amount
2018 | $ | 30,382 |
2019 | 19,942 |
2020 | 19,220 |
2021 | 12,683 |
2022 | 1,331 |
Thereafter | 3,064 |
Total amortizable purchased intangible assets | 86,622 |
In-process research and development | 5,100 |
Total intangible assets | $ | 91,722 |

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