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Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets Activity Summary - Indefinite-lived | Intangible assets are summarized as follows (in thousands):
| September 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 | $ | 9,568 |  | $ | (6,238) |  | $ | 3,330 |  |  | $ | 9,510 |  | $ | (5,730) |  | $ | 3,780 |
Licenses | 1,414 |  | (1,414) |  | — |  |  | 1,414 |  | (1,334) |  | 80 |
Customer and supplier relationships | 241 |  | (185) |  | 56 |  |  | 241 |  | (172) |  | 69 |
Non-compete agreements | 120 |  | (120) |  | — |  |  | 120 |  | (98) |  | 22 |
Total amortized intangible assets | $ | 11,343 |  | $ | (7,957) |  | $ | 3,386 |  |  | $ | 11,285 |  | $ | (7,334) |  | $ | 3,951 |
Unamortized Intangible Assets: |  |  |  |  |  |  |
Tradenames and trademarks | $ | 1,008 |  |  | $ | 1,008 |  |  | $ | 1,008 |  |  | $ | 1,008 |
Patents in Process | 1,226 |  |  | 1,226 |  |  | 1,045 |  |  | 1,045 |
Total intangible assets | $ | 13,577 |  |  | $ | 5,620 |  |  | $ | 13,338 |  |  | $ | 6,004 |
Intangible Assets Activity Summary - Finite-lived | Intangible assets are summarized as follows (in thousands):
| September 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 | $ | 9,568 |  | $ | (6,238) |  | $ | 3,330 |  |  | $ | 9,510 |  | $ | (5,730) |  | $ | 3,780 |
Licenses | 1,414 |  | (1,414) |  | — |  |  | 1,414 |  | (1,334) |  | 80 |
Customer and supplier relationships | 241 |  | (185) |  | 56 |  |  | 241 |  | (172) |  | 69 |
Non-compete agreements | 120 |  | (120) |  | — |  |  | 120 |  | (98) |  | 22 |
Total amortized intangible assets | $ | 11,343 |  | $ | (7,957) |  | $ | 3,386 |  |  | $ | 11,285 |  | $ | (7,334) |  | $ | 3,951 |
Unamortized Intangible Assets: |  |  |  |  |  |  |
Tradenames and trademarks | $ | 1,008 |  |  | $ | 1,008 |  |  | $ | 1,008 |  |  | $ | 1,008 |
Patents in Process | 1,226 |  |  | 1,226 |  |  | 1,045 |  |  | 1,045 |
Total intangible assets | $ | 13,577 |  |  | $ | 5,620 |  |  | $ | 13,338 |  |  | $ | 6,004 |
Amortization expense for the three and nine months ended September 30, 2021 and 2020 is summarized in the table below (amounts in thousands):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Amortization expense | $ | 193 |  |  | $ | 276 |  |  | $ | 647 |  |  | $ | 818 |
Estimated Future Amortization Expense for Intangible Assets | Expected future amortization of intangible assets as of September 30, 2021, is as follows (in thousands):
Year ending December 31, | Estimated Amortization Expense
2021 (excluding the nine months ended September 30, 2021) | $ | 174 |
2022 | 695 |
2023 | 695 |
2024 | 695 |
2025 | 283 |
Thereafter | 844 |
Total amortized intangible assets | $ | 3,386 |

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