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Intangible Assets, net | 6 Months Ended
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Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets, net | Intangible Assets, net Intangible assets consist as of June 30, 2021 and December 31, 2020 of the following:
| Amortization Period in Years |  | June 30, 2021 |  | December 31, 2020
Patents | 20 |  | $ | 1,557 |  |  | $ | 1,293 |
Other indefinite lived intangible assets |  |  | 310 |  |  | 310 |
Total intangible assets, cost |  |  | 1,867 |  |  | 1,603 |
Less: accumulated amortization |  |  | (50) |  |  | (39) |
Intangible assets, net |  |  | $ | 1,817 |  |  | $ | 1,564 |
Amortization expense of intangible assets was $7 and $4 for the three months ended June 30, 2021 and 2020, respectively. Amortization expense of intangible assets was $11 and $8 for the six months ended June 30, 2021 and 2020, respectively.

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- Definition The entire disclosure for all or part of the information related to 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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