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Intangible Assets | 6 Months Ended
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Jun. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | 4. Intangible Assets Intangible assets as of June 30, 2022 and December 31, 2021 are comprised of the following (in thousands):
|  | June 30, 2022 |
|  | Gross amount |  |  | Accumulated amortization |  |  | Net amount |
Intellectual property assets |  | $ | 8,711 |  |  | $ | (6,732 | ) |  | $ | 1,979 |
Intangible assets |  | $ | 8,711 |  |  | $ | (6,732 | ) |  | $ | 1,979 |
|  | December 31, 2021 |
|  | Gross amount |  |  | Accumulated amortization |  |  | Net amount |
Intellectual property assets |  | $ | 9,312 |  |  | $ | (6,935 | ) |  | $ | 2,377 |
Intangible assets |  | $ | 9,312 |  |  | $ | (6,935 | ) |  | $ | 2,377 |
Aggregate amortization expenses for intangible assets totaled $363 thousand and $372 thousand for the six months ended June 30, 2022 and 2021, respectively.

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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 https://asc.fasb.org/topic&trid=2144416 + Details
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