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Goodwill and Intangible Assets, Net (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | Changes in the carrying amount of goodwill were as follows:
(In thousands) |
Balance at December 31, 2015 | $ | 43,116 |
Foreign exchange effects | (64 | )
Balance at December 31, 2016 | 43,052 |
Goodwill acquired during the period (1) | 5,494 |
Foreign exchange effects | 105 |
Balance at December 31, 2017 | $ | 48,651 |
(1) | During 2017, we recognized $5.5 million of goodwill related to the Residential Control Systems, Inc. acquisition. Refer to Note 22 for further information about this acquisition.
Schedule of Components of Intangible Assets | The components of intangible assets, net were as follows:
| December 31,
| 2017 |  | 2016
(In thousands) | Gross (1) |  | Accumulated Amortization (1) |  | Net (1) |  | Gross (1) |  | Accumulated Amortization (1) |  | Net (1)
Distribution rights (10 years) | $ | 344 |  |  | $ | (165 | ) |  | $ | 179 |  |  | $ | 302 |  |  | $ | (119 | ) |  | $ | 183 |
Patents (10 years) | 13,250 |  |  | (5,310 | ) |  | 7,940 |  |  | 12,038 |  |  | (4,775 | ) |  | 7,263 |
Trademarks and trade names (10 years) (2) | 2,786 |  |  | (1,594 | ) |  | 1,192 |  |  | 2,400 |  |  | (1,310 | ) |  | 1,090 |
Developed and core technology (5-15 years) | 12,560 |  |  | (6,071 | ) |  | 6,489 |  |  | 12,585 |  |  | (4,068 | ) |  | 8,517 |
Capitalized software development costs (2 years) | 142 |  |  | (77 | ) |  | 65 |  |  | 142 |  |  | (5 | ) |  | 137 |
Customer relationships (10-15 years) (2) | 32,534 |  |  | (19,395 | ) |  | 13,139 |  |  | 27,703 |  |  | (16,344 | ) |  | 11,359 |
Order Backlog (1 year) (2) | 150 |  |  | (113 | ) |  | 37 |  |  | — |  |  | — |  |  | — |
Total intangible assets, net | $ | 61,766 |  |  | $ | (32,725 | ) |  | $ | 29,041 |  |  | $ | 55,170 |  |  | $ | (26,621 | ) |  | $ | 28,549 |
(1) | This table excludes the gross value of fully amortized intangible assets totaling $6.0 million and $10.2 million on December 31, 2017 and 2016, respectively.
(2) | During the second quarter of 2017, we purchased a trade name valued at $0.4 million, which is being amortized ratably over eight years; customer relationships valued at $5.0 million, which are being amortized ratably over 10 years; and order backlog valued at $0.2 million, which is being amortized ratably over one year. Refer to Note 22 for further information regarding our purchase of these intangible assets.
Intangible Assets Amortization Expense | Amortization expense by statement of operations caption was as follows:
| Year Ended December 31,
(In thousands) | 2017 |  | 2016 |  | 2015
Cost of sales | $ | 184 |  |  | $ | 76 |  |  | $ | 123 |
Selling, general and administrative expenses | 6,772 |  |  | 6,198 |  |  | 4,719 |
Total amortization expense | $ | 6,956 |  |  | $ | 6,274 |  |  | $ | 4,842 |
Schedule of Estimated Future Amortization Expense | Estimated future annual amortization expense related to our intangible assets at December 31, 2017, is as follows:
(In thousands) |
2018 | $ | 7,275 |
2019 | 7,070 |
2020 | 5,925 |
2021 | 2,418 |
2022 | 2,307 |
Thereafter | 4,046 |
Total | $ | 29,041 |

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