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PROPERTY AND EQUIPMENT | 6 Months Ended
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Jun. 30, 2020
PROPERTY AND EQUIPMENT |
PROPERTY AND EQUIPMENT | (2) PROPERTY AND EQUIPMENT The components of property and equipment are as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | June 30, 2020 |  | December 31, 2019
Property and equipment | ​ | ​ |  | ​ | ​ |
Office furniture and equipment | ​ | $ | 1,788 | ​ | $ | 1,178
Assembly equipment | ​ | ​ | 128 | ​ | ​ | 128
Vehicles | ​ | ​ | 181 | ​ | ​ | 181
Leasehold improvements | ​ | ​ | 544 | ​ | ​ | 500
Leased devices | ​ | ​ | 1,180 | ​ | ​ | 934
​ | ​ | $ | 3,821 | ​ | ​ | 2,921
Less accumulated depreciation | ​ | ​ | (2,429) | ​ | ​ | (2,063)
​ | ​ | $ | 1,392 | ​ | $ | 858
​ The Company monitors devices out on lease for potential loss and places an estimated reserve on the net book value based on historical loss rates. Total depreciation expense related to our property and equipment was $97,000 and $76,000 for the three months ended June 30, 2020 and 2019, respectively. Depreciation expense for the six-month periods ended June 30, 2020 and 2019 was $166,000 and $143,000, respectively. Total depreciation expense related to devices out on lease was $0.2 million and $0.1 million for the three months ended June 30, 2020 and 2019, respectively. Depreciation expense related to devices out on lease was $0.4 million and $0.2 million for the six months ended June 30, 2020 and 2019, 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 assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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