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Intangible Assets | 12 Months Ended
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Dec. 31, 2020
Intangible Assets |
Intangible Assets | 3. Intangible Assets Intangibl e assets as of December 31, 2020, an d 2019 consisted of the following:
|  | Estimated useful lives |  |  | As of December 31, |
|  | (in years) |  |  | 2020 |  |  | 2019 |
Tradename |  |  | 5 | to | 7 |  |  | $ | 555 |  |  | $ | 555 |
Patents and technological know-how |  |  |  | 10 |  |  |  |  | 25,427 |  |  |  | 18,494 |
Proprietary software |  |  | 3 | to | 15 |  |  |  | 2,981 |  |  |  | 2,981 |
Other |  |  | 3 | to | 5 |  |  |  | 323 |  |  |  | 323 |
Total intangible assets, gross |  |  |  |  |  |  |  |  | 29,286 |  |  |  | 22,353 |
Accumulated amortization |  |  |  |  |  |  |  |  | (10,038 | ) |  |  | (8,344 | )
Total intangible assets, net |  |  |  |  |  |  |  | $ | 19,248 |  |  | $ | 14,009 |
Patents and technological know-how include capitalized legal expenses, net of amortization of $16,582 related 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, 2020 and 2019, amortization of these intangible assets were $1,694 and $1,402 respectively. The estimated future amortization expense of intangible assets is as follows:
Years ending December 31, |  |  |  |
2021 |  | $ | 1,959 |
2022 |  |  | 1,959 |
2023 |  |  | 1,952 |
2024 |  |  | 1,689 |
2025 |  |  | 1,628 |
Thereafter |  |  | 10,061 |
Total |  | $ | 19,248 |

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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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