| Intangible Assets, Net |
Intangible assets, net consisted of the following:
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| (in thousands) |
|
June 30,
2020 |
|
December 31,
2019 |
|
June 30,
2019 |
| Intangible assets subject to amortization: |
|
|
|
|
|
|
| Patents and purchased technology |
|
$ |
14,198 |
|
|
$ |
14,198 |
|
|
$ |
14,198 |
|
| Customer relationships |
|
23,000 |
|
|
23,000 |
|
|
23,000 |
|
|
|
|
|
|
|
|
| Gross carrying amount |
|
37,198 |
|
|
37,198 |
|
|
37,198 |
|
| Accumulated amortization: |
|
|
|
|
|
|
| Patents and purchased technology |
|
(13,976) |
|
|
(13,311) |
|
|
(12,646) |
|
| Customer relationships |
|
(16,538) |
|
|
(15,713) |
|
|
(14,888) |
|
|
|
|
|
|
|
|
| Total accumulated amortization |
|
(30,514) |
|
|
(29,024) |
|
|
(27,534) |
|
| Net carrying amount |
|
6,684 |
|
|
8,174 |
|
|
9,664 |
|
| Intangible assets not subject to amortization |
|
115,421 |
|
|
115,421 |
|
|
115,421 |
|
| Intangible assets, net |
|
$ |
122,105 |
|
|
$ |
123,595 |
|
|
$ |
125,085 |
|
Amortization expense for intangible assets subject to amortization was $0.7 million for both the three months ended June 30, 2020 and 2019, and was $1.5 million for both the six months ended June 30, 2020 and 2019.
Annual amortization expense is estimated to be as follows for the years 2020 through 2024:
|
|
|
|
|
|
| (in thousands) |
|
| 2020 |
$ |
2,537 |
|
| 2021 |
1,650 |
|
| 2022 |
1,650 |
|
| 2023 |
1,650 |
|
| 2024 |
688 |
|
|