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Goodwill and Intangible Assets, Net (Tables) | 3 Months Ended
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Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in the Carrying Amount of Goodwill | Changes in the carrying amount of goodwill were as follows:
(In thousands) |
Balance at December 31, 2017 | $ | 48,651 |
Foreign exchange effects | (31 | )
Balance at March 31, 2018 | $ | 48,620 |
Components of Intangible Assets, Net | The components of intangible assets, net were as follows:
| March 31, 2018 |  | December 31, 2017
(In thousands) | Gross (1) |  | Accumulated Amortization (1) |  | Net |  | Gross (1) |  | Accumulated Amortization (1) |  | Net
Distribution rights | $ | 353 |  |  | $ | (177 | ) |  | $ | 176 |  |  | $ | 344 |  |  | $ | (165 | ) |  | $ | 179 |
Patents | 13,258 |  |  | (5,088 | ) |  | 8,170 |  |  | 13,250 |  |  | (5,310 | ) |  | 7,940 |
Trademarks and trade names | 2,776 |  |  | (1,663 | ) |  | 1,113 |  |  | 2,786 |  |  | (1,594 | ) |  | 1,192 |
Developed and core technology | 12,544 |  |  | (6,565 | ) |  | 5,979 |  |  | 12,560 |  |  | (6,071 | ) |  | 6,489 |
Capitalized software development costs | 142 |  |  | (95 | ) |  | 47 |  |  | 142 |  |  | (77 | ) |  | 65 |
Customer relationships | 32,425 |  |  | (20,134 | ) |  | 12,291 |  |  | 32,534 |  |  | (19,395 | ) |  | 13,139 |
Order backlog | 150 |  |  | (150 | ) |  | — |  |  | 150 |  |  | (113 | ) |  | 37 |
Total intangible assets, net | $ | 61,648 |  |  | $ | (33,872 | ) |  | $ | 27,776 |  |  | $ | 61,766 |  |  | $ | (32,725 | ) |  | $ | 29,041 |
(1) | This table excludes the gross value of fully amortized intangible assets totaling $6.5 million and $6.0 million at March 31, 2018 and December 31, 2017, respectively.
Amortization Expense by Income Statement Caption | Amortization expense by income statement caption was as follows:
| Three Months Ended March 31,
(In thousands) | 2018 |  | 2017
Cost of sales | $ | 55 |  |  | $ | 19 |
Selling, general and administrative expenses | 1,747 |  |  | 1,581 |
Total amortization expense | $ | 1,802 |  |  | $ | 1,600 |
Estimated Future Amortization Expense Related to Intangible Assets | Estimated future annual amortization expense related to our intangible assets at March 31, 2018, is as follows:
(In thousands) |
2018 (remaining 9 months) | $ | 5,342 |
2019 | 6,984 |
2020 | 5,823 |
2021 | 2,341 |
2022 | 2,392 |
Thereafter | 4,894 |
Total | $ | 27,776 |

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