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Intangible Assets | 12 Months Ended
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Dec. 31, 2021
Intangible Assets |
Intangible Assets | 3. Intangible Assets Intangibl e assets as of December 31, 2021 an d 2020 consisted of the following:
|  | Estimated useful lives |  |  | As of December 31, |
|  | (in years) |  |  | 2021 |  |  | 2020 |
Tradename |  |  | 5 | to | 7 |  |  | $ | 555 |  |  | $ | 555 |
Patents and technological know-how |  |  |  | 10 |  |  |  |  | 33,553 |  |  |  | 25,427 |
Proprietary software |  |  | 3 | to | 15 |  |  |  | 2,981 |  |  |  | 2,981 |
Other |  |  | 3 | to | 5 |  |  |  | 323 |  |  |  | 323 |
Total intangible assets, gross |  |  |  |  |  |  |  |  | 37,412 |  |  |  | 29,286 |
Accumulated amortization |  |  |  |  |  |  |  |  | (12,326 | ) |  |  | (10,038 | )
Total intangible assets, net |  |  |  |  |  |  |  | $ | 25,086 |  |  | $ | 19,248 |
Patents and technological know-how include capitalized legal expenses, net of amortizatio n of $22,637 rela ted to our defense of patents from infringement by our competitors. Legal expenses have been capitalized upon satisfaction of two conditions: (a) a determination being made that a successful defense of this litigation is probable, and (b) that the monetary benefits arising out of such successful defense will be in excess of the costs for the defense. Please refer to Note 8 - Commitments and Contingencies for additional information. During t he years ended December 31, 2021 and 2020, amortization of these intangible assets were $2,288 and $1,694 respectively. The estimated future amortization expense of intangible assets is as follows:
Years ending December 31, |  |  |  |
2022 |  | $ | 2,683 |
2023 |  |  | 2,677 |
2024 |  |  | 2,413 |
2025 |  |  | 2,351 |
2026 |  |  | 2,351 |
Thereafter |  |  | 12,611 |
Total |  | $ | 25,086 |

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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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