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Intangible Assets (Tables) | 6 Months Ended
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Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets Activity Summary - Indefinite-lived | Intangible assets are summarized as follows (in thousands):
| June 30, 2021 |  | December 31, 2020
| Gross Carrying Amount | Accumulated Amortization | Net Carrying Amount |  | Gross Carrying Amount | Accumulated Amortization | Net Carrying Amount
Amortized intangible assets |  |  |  |  |  |  |
Patents and know how | $ | 9,546 |  | $ | (6,069) |  | $ | 3,477 |  |  | $ | 9,510 |  | $ | (5,730) |  | $ | 3,780 |
Licenses | 1,414 |  | (1,403) |  | 11 |  |  | 1,414 |  | (1,334) |  | 80 |
Customer and supplier relationships | 241 |  | (181) |  | 60 |  |  | 241 |  | (172) |  | 69 |
Non-compete agreements | 120 |  | (113) |  | 7 |  |  | 120 |  | (98) |  | 22 |
Total amortized intangible assets | $ | 11,321 |  | $ | (7,766) |  | $ | 3,555 |  |  | $ | 11,285 |  | $ | (7,334) |  | $ | 3,951 |
Unamortized intangible assets |  |  |  |  |  |  |
Trade names and trademarks | $ | 1,008 |  |  | $ | 1,008 |  |  | $ | 1,008 |  |  | $ | 1,008 |
Patents in process | 1,187 |  |  | 1,187 |  |  | 1,045 |  |  | 1,045 |
Total intangible assets | $ | 13,516 |  |  | $ | 5,750 |  |  | $ | 13,338 |  |  | $ | 6,004 |
Intangible Assets Activity Summary - Finite-lived | Intangible assets are summarized as follows (in thousands):
| June 30, 2021 |  | December 31, 2020
| Gross Carrying Amount | Accumulated Amortization | Net Carrying Amount |  | Gross Carrying Amount | Accumulated Amortization | Net Carrying Amount
Amortized intangible assets |  |  |  |  |  |  |
Patents and know how | $ | 9,546 |  | $ | (6,069) |  | $ | 3,477 |  |  | $ | 9,510 |  | $ | (5,730) |  | $ | 3,780 |
Licenses | 1,414 |  | (1,403) |  | 11 |  |  | 1,414 |  | (1,334) |  | 80 |
Customer and supplier relationships | 241 |  | (181) |  | 60 |  |  | 241 |  | (172) |  | 69 |
Non-compete agreements | 120 |  | (113) |  | 7 |  |  | 120 |  | (98) |  | 22 |
Total amortized intangible assets | $ | 11,321 |  | $ | (7,766) |  | $ | 3,555 |  |  | $ | 11,285 |  | $ | (7,334) |  | $ | 3,951 |
Unamortized intangible assets |  |  |  |  |  |  |
Trade names and trademarks | $ | 1,008 |  |  | $ | 1,008 |  |  | $ | 1,008 |  |  | $ | 1,008 |
Patents in process | 1,187 |  |  | 1,187 |  |  | 1,045 |  |  | 1,045 |
Total intangible assets | $ | 13,516 |  |  | $ | 5,750 |  |  | $ | 13,338 |  |  | $ | 6,004 |
Amortization expense for the three and six months ended June 30, 2021 and 2020 is summarized in the table below (amounts in thousands):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Amortization expense | $ | 215 |  |  | $ | 271 |  |  | $ | 454 |  |  | $ | 542 |
Estimated Future Amortization Expense for Intangible Assets | Expected future amortization of intangible assets as of June 30, 2021, is as follows (in thousands):
Year ending December 31, | Estimated Amortization Expense
2021 (excluding the six months ended June 30, 2021) | $ | 366 |
2022 | 694 |
2023 | 694 |
2024 | 694 |
2025 | 282 |
Thereafter | 825 |
Total amortized intangible assets | $ | 3,555 |

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