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PROPERTY AND EQUIPMENT | 12 Months Ended
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Dec. 31, 2022
PROPERTY AND EQUIPMENT |
PROPERTY AND EQUIPMENT | (4) PROPERTY AND EQUIPMENT The components of property and equipment are as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2022 |  | December 31, 2021
Property and equipment | ​ | ​ |  |  | ​ |
Office furniture and equipment | ​ | $ | 2,819 | ​ | $ | 2,391
Assembly equipment | ​ |  | 110 | ​ |  | 100
Vehicles | ​ |  | 203 | ​ |  | 203
Leasehold improvements | ​ |  | 1,173 | ​ |  | 1,054
Leased devices | ​ |  | 1,162 | ​ |  | 1,080
​ | ​ | $ | 5,467 | ​ | $ | 4,828
Less accumulated depreciation | ​ |  | (3,292) | ​ |  | (2,642)
​ | ​ | $ | 2,175 | ​ | $ | 2,186
​ The Company monitors devices out on lease for potential loss and places an estimated reserve on the net book value based on an analysis of the number of units of which are still with patients for which the Company cannot determine the current status. Total depreciation expense related to our purchased property and equipment was $0.7 million and $0.9 million for the years ended December 31, 2022 and 2021, respectively. Total depreciation expense related to devices out on lease was $1.5 million and $1.4 million for the years ended December 31, 2022 and 2021, respectively. Depreciation on leased units is reflected on the income statement as cost of revenue.

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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 https://asc.fasb.org/extlink&oid=126982197&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI https://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 https://asc.fasb.org/extlink&oid=126982197&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 https://asc.fasb.org/extlink&oid=126982197&loc=d3e99779-112916 + Details
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