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Goodwill and Intangible Assets, Net (Tables) | 6 Months Ended
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Jun. 30, 2019
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, 2018 | $ | 48,485 |
Foreign exchange effects | (13 | )
Balance at June 30, 2019 | $ | 48,472 |
Components of Intangible Assets, Net | The components of intangible assets, net were as follows:
| June 30, 2019 |  | December 31, 2018
(In thousands) | Gross (1) |  | Accumulated Amortization (1) |  | Net |  | Gross (1) |  | Accumulated Amortization (1) |  | Net
Distribution rights | $ | 326 |  |  | $ | (199 | ) |  | $ | 127 |  |  | $ | 329 |  |  | $ | (188 | ) |  | $ | 141 |
Patents | 15,254 |  |  | (6,041 | ) |  | 9,213 |  |  | 14,560 |  |  | (5,704 | ) |  | 8,856 |
Trademarks and trade names | 2,786 |  |  | (2,053 | ) |  | 733 |  |  | 2,786 |  |  | (1,900 | ) |  | 886 |
Developed and core technology | 12,560 |  |  | (9,095 | ) |  | 3,465 |  |  | 12,560 |  |  | (8,087 | ) |  | 4,473 |
Capitalized software development costs | 288 |  |  | — |  |  | 288 |  |  | 155 |  |  | — |  |  | 155 |
Customer relationships | 32,684 |  |  | (24,464 | ) |  | 8,220 |  |  | 32,534 |  |  | (22,675 | ) |  | 9,859 |
Total intangible assets, net | $ | 63,898 |  |  | $ | (41,852 | ) |  | $ | 22,046 |  |  | $ | 62,924 |  |  | $ | (38,554 | ) |  | $ | 24,370 |
(1) | This table excludes the gross value of fully amortized intangible assets totaling $7.2 million and $7.1 million at June 30, 2019 and December 31, 2018, respectively.
Amortization Expense by Income Statement Caption | Amortization expense by statement of operations caption was as follows:
| Three Months Ended June 30, |  | Six Months Ended June 30,
(In thousands) | 2019 |  | 2018 |  | 2019 |  | 2018
Cost of sales | $ | — |  |  | $ | 18 |  |  | $ | — |  |  | $ | 73 |
Selling, general and administrative expenses | 1,800 |  |  | 1,758 |  |  | 3,584 |  |  | 3,505 |
Total amortization expense | $ | 1,800 |  |  | $ | 1,776 |  |  | $ | 3,584 |  |  | $ | 3,578 |
Estimated Future Amortization Expense Related to Intangible Assets | Estimated future annual amortization expense related to our intangible assets at June 30, 2019, was as follows:
(In thousands) |
2019 (remaining 6 months) | $ | 3,635 |
2020 | 6,137 |
2021 | 2,575 |
2022 | 2,354 |
2023 | 2,209 |
Thereafter | 5,136 |
Total | $ | 22,046 |

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