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PROPERTY AND EQUIPMENT | 12 Months Ended
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Dec. 31, 2020
PROPERTY AND EQUIPMENT |
PROPERTY AND EQUIPMENT | (3) PROPERTY AND EQUIPMENT The components of property and equipment are as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2020 |  | December 31, 2019
Property and equipment | ​ | ​ |  |  | ​ |
Office furniture and equipment | ​ | $ | 2,362 | ​ | $ | 1,178
Assembly equipment | ​ |  | 143 | ​ |  | 128
Vehicles | ​ |  | 198 | ​ |  | 181
Leasehold improvements | ​ |  | 559 | ​ |  | 500
Sales Rep demo units | ​ | ​ | 361 | ​ | ​ | —
Leased devices | ​ |  | 809 | ​ |  | 934
​ | ​ | $ | 4,432 | ​ | $ | 2,921
Less accumulated depreciation | ​ |  | (2,507) | ​ |  | (2,063)
​ | ​ | $ | 1,925 | ​ | $ | 858
​ 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 $0.3 million for the years ended December 31, 2020 and 2019, respectively. Total depreciation expense related to devices out on lease was $0.8 million and $0.5 million for the years ended December 31, 2020 and 2019, respectively. Depreciation on leased units is reflected on the income statement as cost of revenue. ​ During the year ended December 31, 2020, the Company began capitalizing product demo units sent to its territory managers to use in the field. The Company monitors these devices for potential losses and places an estimated reserve on the net book value based on an analysis of terminated territory managers that have not yet returned their units. Total depreciation expense related to demo unit devices out with sales rep was $0.2 million for the year ended December 31, 2020. Deprecation on demo units is reflected on the income statement as sales and marketing expense.

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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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