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PROPERTY AND EQUIPMENT
 9 Months Ended
Sep. 30, 2020
PROPERTY AND EQUIPMENT  
PROPERTY AND EQUIPMENT

(2)   PROPERTY AND EQUIPMENT

The components of property and equipment are as follows (in thousands):

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September 30, 2020

    

December 31, 2019

Property and equipment

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​

  

 

​

  

Office furniture and equipment

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$

1,894

​

$

1,178

Assembly equipment

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128

​

 

128

Vehicles

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181

​

 

181

Leasehold improvements

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544

​

 

500

Sales Rep demo units

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​

335

​

​

—

Leased devices

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1,396

​

 

934

​

​

$

4,478

​

$

2,921

Less accumulated depreciation

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(2,808)

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(2,063)

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​

$

1,670

​

$

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 $0.3 million and $0.1 million for the three months ended September 30, 2020 and 2019, respectively. Depreciation expense for the nine-month periods ended September 30, 2020 and 2019 was $0.5 million and $0.2 million, respectively.

Total depreciation expense related to devices out on lease was $0.2 million and $0.1 million for the three months ended September 30, 2020 and 2019, respectively. Depreciation expense related to devices out on lease was $0.6 million and $0.4 million for the nine-months ended September 30, 2020 and 2019, respectively. Depreciation on leased units is reflected on the income statement as cost of revenue.

During the nine months ended September 30, 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 loss 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.