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Intangible Assets | 9 Months Ended
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Sep. 30, 2021
Intangible Assets |
Intangible Assets | 5. Intangible Assets Intangible assets as of September 30, 2021 and December 31, 2020 consisted of the following:
|  | Estimated useful lives (years) |  |  | September 30, 2021 |  |  | December 31, 2020 |
Tradename |  | 5 | to | 7 |  |  | $ | 555 |  |  | $ | 555 |
Patents and technological know-how |  | 10 | to | 20 |  |  |  | 30,994 |  |  |  | 25,427 |
Proprietary software |  | 3 | to | 15 |  |  |  | 2,981 |  |  |  | 2,981 |
Other |  | 3 | to | 5 |  |  |  | 323 |  |  |  | 323 |
Total intangible assets |  |  |  |  |  |  |  | 34,853 |  |  |  | 29,286 |
Accumulated amortization |  |  |  |  |  |  |  | (11,674 | ) |  |  | (10,038 | )
Total intangible assets, net |  |  |  |  |  |  | $ | 23,179 |  |  | $ | 19,248 |
The amortization of intangible assets for the three months ended September 30, 2021 and 2020 was as follows:
|  | Three months ended September 30, |  |  | Nine months ended September 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Amortization of intangible assets |  | $ | 582 |  |  | $ | 446 |  |  | $ | 1,636 |  |  | $ | 1,220 |
The estimated future amortization expense of intangible assets is as follows:
Years ending December 31, |  | Amount |
2021 (Remainder) |  | $ | 611 |
2022 |  |  | 2,445 |
2023 |  |  | 2,438 |
2024 |  |  | 2,174 |
2025 |  |  | 2,113 |
Thereafter |  |  | 13,398 |
Total |  |  | 23,179 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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