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Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Intangible assets: |  |  |  |  |
Gross Carrying Amount | $ 1,985 |  | $ 1,985 |  | $ 1,716
Accumulated Amortization | (73) |  | (73) |  | (66)
Amortization expense | $ 3 | $ 3 | $ 7 | $ 8 |
Minimum |  |  |  |  |
Intangible assets: |  |  |  |  |
Useful lives of intangible assets | 3 years |  | 3 years |  |
Maximum |  |  |  |  |
Intangible assets: |  |  |  |  |
Useful lives of intangible assets | 20 years |  | 20 years |  |
Licenses |  |  |  |  |
Intangible assets: |  |  |  |  |
Gross Carrying Amount | $ 149 |  | $ 149 |  | 149
Accumulated Amortization | (65) |  | (65) |  | (61)
Patents |  |  |  |  |
Intangible assets: |  |  |  |  |
Gross Carrying Amount | 130 |  | 130 |  | 92
Accumulated Amortization | (8) |  | (8) |  | (5)
Patents pending |  |  |  |  |
Intangible assets: |  |  |  |  |
Gross Carrying Amount | 1,671 |  | 1,671 |  | 1,444
Trademarks |  |  |  |  |
Intangible assets: |  |  |  |  |
Gross Carrying Amount | 13 |  | 13 |  | 13
Trademarks pending |  |  |  |  |
Intangible assets: |  |  |  |  |
Gross Carrying Amount | $ 22 |  | $ 22 |  | $ 18

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482640/350-30-55-40 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482686/350-30-45-2 + Details
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