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Goodwill and Intangible Assets, Net (Tables) | 6 Months Ended
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Jun. 30, 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 | (129 | )
Balance at June 30, 2018 | $ | 48,522 |
Components of Intangible Assets, Net | The components of intangible assets, net were as follows:
| June 30, 2018 |  | December 31, 2017
(In thousands) | Gross (1) |  | Accumulated Amortization (1) |  | Net |  | Gross (1) |  | Accumulated Amortization (1) |  | Net
Distribution rights | $ | 335 |  |  | $ | (176 | ) |  | $ | 159 |  |  | $ | 344 |  |  | $ | (165 | ) |  | $ | 179 |
Patents | 13,662 |  |  | (5,218 | ) |  | 8,444 |  |  | 13,250 |  |  | (5,310 | ) |  | 7,940 |
Trademarks and trade names | 2,786 |  |  | (1,746 | ) |  | 1,040 |  |  | 2,786 |  |  | (1,594 | ) |  | 1,192 |
Developed and core technology | 12,560 |  |  | (7,079 | ) |  | 5,481 |  |  | 12,560 |  |  | (6,071 | ) |  | 6,489 |
Capitalized software development costs | 198 |  |  | (113 | ) |  | 85 |  |  | 142 |  |  | (77 | ) |  | 65 |
Customer relationships | 32,534 |  |  | (21,035 | ) |  | 11,499 |  |  | 32,534 |  |  | (19,395 | ) |  | 13,139 |
Order backlog | — |  |  | — |  |  | — |  |  | 150 |  |  | (113 | ) |  | 37 |
Total intangible assets, net | $ | 62,075 |  |  | $ | (35,367 | ) |  | $ | 26,708 |  |  | $ | 61,766 |  |  | $ | (32,725 | ) |  | $ | 29,041 |
(1) | This table excludes the gross value of fully amortized intangible assets totaling $6.8 million and $6.0 million at June 30, 2018 and December 31, 2017, respectively.
Amortization Expense by Income Statement Caption | Amortization expense by income statement caption was as follows:
| Three Months Ended June 30, |  | Six Months Ended June 30,
(In thousands) | 2018 |  | 2017 |  | 2018 |  | 2017
Cost of sales | $ | 18 |  |  | $ | 55 |  |  | $ | 73 |  |  | $ | 74 |
Selling, general and administrative expenses | 1,758 |  |  | 1,736 |  |  | 3,505 |  |  | 3,317 |
Total amortization expense | $ | 1,776 |  |  | $ | 1,791 |  |  | $ | 3,578 |  |  | $ | 3,391 |
Estimated Future Amortization Expense Related to Intangible Assets | Estimated future annual amortization expense related to our intangible assets at June 30, 2018, was as follows:
(In thousands) |
2018 (remaining 6 months) | $ | 3,506 |
2019 | 6,922 |
2020 | 5,791 |
2021 | 2,253 |
2022 | 2,143 |
Thereafter | 6,093 |
Total | $ | 26,708 |

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