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Property and Equipment | 12 Months Ended
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Dec. 31, 2021
Property and Equipment |
Property and Equipment | 5. Property and Equipment Major classifications of property and equipment and estimated useful lives were as follows:
|  | Estimated useful lives |  | As of December 31, |
|  | in years |  | 2021 |  |  | 2020 |
Office furniture and equipment |  |  | 3 | to | 10 |  | $ | 5,410 |  |  | $ | 5,219 |
Leasehold improvements |  |  | 2 | to | 7 |  |  | 1,610 |  |  |  | 1,610 |
Vehicles |  |  | 5 | to | 10 |  |  | 206 |  |  |  | 206 |
Manufacturing and test equipment |  |  | 2 | to | 10 |  |  | 2,846 |  |  |  | 2,833 |
|  |  |  |  |  |  |  | 10,072 |  |  |  | 9,868 |
Accumulated depreciation and amortization |  |  |  |  |  |  |  | (9,328 | ) |  |  | (8,962 | )
Property and equipment, net |  |  |  |  |  |  | $ | 744 |  |  | $ | 906 |
Depreciation expense on property and equipment for t he years ended December 31, 2021 and 2020 was $378 and $422, 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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