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PROPERTY AND EQUIPMENT | 3 Months Ended
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Mar. 31, 2024
Property, Plant and Equipment [Abstract] |
PROPERTY AND EQUIPMENT | PROPERTY AND EQUIPMENT Property and equipment are stated at cost and depreciated using the straight-line method over the estimated useful lives of the related assets and consist of the following (in thousands):
| March 31, 2024 |  | December 31, 2023
Equipment (useful life 3 to 15 years) | $ | 1,061 |  |  | $ | 1,061 |
Tooling (useful life 2 to 5 years) | 190 |  |  | 190 |
Vehicles (useful life 5 years) | 41 |  |  | 41 |
Leasehold improvements (the shorter of useful life or lease life) | 141 |  |  | 141 |
Projects in progress | 28 |  |  | 28 |
Property and equipment at cost | 1,461 |  |  | 1,461 |
Less: accumulated depreciation | (1,357) |  |  | (1,349) |
Property and equipment, net | $ | 104 |  |  | $ | 112 |
Depreciation expense was $8 thousand and $8 thousand for the three months ended March 31, 2024 and 2023, respectively.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//360/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 6 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 7 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-7 + Details
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