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Property and Equipment | 9 Months Ended
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Sep. 30, 2021
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):
| September 30, 2021 |  | December 31, 2020
Equipment (useful life 3 to 15 years) | $ | 1,308 |  |  | $ | 1,281 |
Tooling (useful life 2 to 5 years) | 324 |  |  | 240 |
Vehicles (useful life 5 years) | 83 |  |  | 47 |
Furniture and fixtures (useful life 5 years) | 86 |  |  | 137 |
Computer software (useful life 3 years) | 1,189 |  |  | 1,057 |
Leasehold improvements (the shorter of useful life or lease life) | 169 |  |  | 169 |
Finance lease right-of-use asset | 13 |  |  | 13 |
UV - Robots (useful life 5 years) | 105 |  |  | — |
Projects in progress | 68 |  |  | 140 |
Property and equipment at cost | 3,345 |  |  | 3,084 |
Less: accumulated depreciation | (2,757) |  |  | (2,664) |
Property and equipment, net | $ | 588 |  |  | $ | 420 |
Depreciation expense was $43 thousand and $48 thousand for the three months ended September 30, 2021 and 2020, respectively. For the nine months ended September 30, 2021 and 2020, depreciation expense was $143 thousand and $140 thousand, 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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