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Intangible Assets - Components of Intangible Assets (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Amortized intangible assets |  |
Gross Carrying Amount | $ 2,908 | $ 2,589
Accumulated Amortization | (931) | (884)
Net Carrying Amount | 1,977 | 1,705
Unamortized intangible assets |  |
Intangible assets, gross | 3,259 | 2,938
Intangible assets, net | 2,328 | 2,054
Trademarks |  |
Unamortized intangible assets |  |
Carrying Amount | 351 | 349
Patents |  |
Amortized intangible assets |  |
Gross Carrying Amount | 1,814 | 1,496
Accumulated Amortization | (159) | (139)
Net Carrying Amount | 1,655 | 1,357
License agreements |  |
Amortized intangible assets |  |
Gross Carrying Amount | 1,094 | 1,093
Accumulated Amortization | (772) | (745)
Net Carrying Amount | $ 322 | $ 348

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