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Intangible Asset and Goodwill (Tables) | 3 Months Ended
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Mar. 31, 2019
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 three months ended March 31, 2019:
Reportable Segment: |  | As of December 31, 2018 |  | Effect of Exchange Rates (1) |  | As of March 31, 2019
|  | (In thousands)
MID |  | $ | 66,643 |  |  | $ | — |  |  | $ | 66,643 |
RSD |  | 140,535 |  |  | 650 |  |  | 141,185 |
Total |  | $ | 207,178 |  |  | $ | 650 |  |  | $ | 207,828 |
(1) Effect of exchange rates relates to foreign currency translation adjustments for the period.
|  | As of
|  | March 31, 2019
Reportable Segment: |  | Gross Carrying Amount |  | Accumulated Impairment Losses |  | Net Carrying Amount
|  | (In thousands)
MID |  | $ | 66,643 |  |  | $ | — |  |  | $ | 66,643 |
RSD |  | 141,185 |  |  | — |  |  | 141,185 |
Other |  | 21,770 |  |  | (21,770 | ) |  | — |
Total |  | $ | 229,598 |  |  | $ | (21,770 | ) |  | $ | 207,828 |
Components of intangible assets | The components of the Company’s intangible assets as of March 31, 2019 and December 31, 2018 were as follows:
|  |  | As of March 31, 2019
| Useful Life |  | Gross Carrying Amount (1) |  | Accumulated Amortization (1) |  | Net Carrying Amount
|  |  | (In thousands)
Existing technology | 3 to 10 years |  | $ | 259,389 |  |  | $ | (217,734 | ) |  | $ | 41,655 |
Customer contracts and contractual relationships | 1 to 10 years |  | 67,395 |  |  | (55,143 | ) |  | 12,252 |
Non-compete agreements and trademarks | 3 years |  | 300 |  |  | (300 | ) |  | — |
In-process research and development | Not applicable |  | 1,600 |  |  | — |  |  | 1,600 |
Total intangible assets |  |  | $ | 328,684 |  |  | $ | (273,177 | ) |  | $ | 55,507 |
|  |  | As of December 31, 2018
| Useful Life |  | Gross Carrying Amount (1) |  | Accumulated Amortization (1) |  | Net Carrying Amount
|  |  | (In thousands)
Existing technology | 3 to 10 years |  | $ | 258,903 |  |  | $ | (213,824 | ) |  | $ | 45,079 |
Customer contracts and contractual relationships | 1 to 10 years |  | 67,667 |  |  | (54,410 | ) |  | 13,257 |
Non-compete agreements and trademarks | 3 years |  | 300 |  |  | (300 | ) |  | — |
In-process research and development | Not applicable |  | 1,600 |  |  | — |  |  | 1,600 |
Total intangible assets |  |  | $ | 328,470 |  |  | $ | (268,534 | ) |  | $ | 59,936 |
(1) The changes in gross carrying amount and accumulated amortization reflect the effects of exchange rates during the period.
Estimated future amortization expense of intangible assets | The estimated future amortization of intangible assets as of March 31, 2019 was as follows (amounts in thousands):
Years Ending December 31: | Amount
2019 (remaining 9 months) | $ | 14,903 |
2020 | 20,023 |
2021 | 13,317 |
2022 | 2,062 |
2023 | 1,541 |
Thereafter | 2,061 |
Total amortizable purchased intangible assets | $ | 53,907 |
In-process research and development | 1,600 |
Total intangible assets | $ | 55,507 |

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