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PROPERTY AND EQUIPMENT
 3 Months Ended
Mar. 31, 2022
PROPERTY AND EQUIPMENT  
PROPERTY AND EQUIPMENT

(2)   PROPERTY AND EQUIPMENT

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

​

​

​

​

​

​

​

​

​

    

March 31, 2022

    

December 31, 2021

Property and equipment

​

​

  

 

​

  

Office furniture and equipment

​

$

2,480

​

$

2,391

Assembly equipment

​

 

100

​

 

100

Vehicles

​

 

203

​

 

203

Leasehold improvements

​

 

1,077

​

 

1,054

Capital projects

​

​

16

​

​

—

Leased devices

​

 

958

​

 

1,080

​

​

$

4,834

​

$

4,828

Less accumulated depreciation

​

 

(2,643)

​

 

(2,642)

​

​

$

2,191

​

$

2,186

​

Total depreciation expense related to property and equipment was $0.2 million and $0.1 million for the three months ended March 31, 2022 and 2021, respectively.

Total depreciation expense related to devices out on lease was $0.3 million and $0.2 million for the three months ended March 31, 2022 and 2021, respectively. Depreciation on leased units is reflected on the income statement as cost of revenue.

During the year ended December 31, 2021, the Company began expensing product demo units sent to its territory managers to use in the field. Total depreciation expense related to demo unit devices out with sales representatives was $0.1 million for the three months ended March 31, 2021.

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.