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PROPERTY, PLANT AND EQUIPMENT
 9 Months Ended
Sep. 30, 2021
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT AND EQUIPMENT

7. PROPERTY, PLANT AND EQUIPMENT

 

Property, plant and equipment are summarized below:

 

   September 30,   December 31, 
   2021   2020 
Machinery and equipment  $1,183   $1,210 
Furniture and fixtures   205    205 
Computer hardware and software   539    669 
Leasehold improvements   322    337 
Construction in progress   141    — 
    2,390    2,421 
Less: accumulated depreciation   (1,912)   (1,988)
Total property, plant and equipment, net  $478   $433 

 

Depreciation expense was $35 and $50 for the three months ended September 30, 2021 and 2020, respectively.

 

Depreciation expense was $110 and $164 for the nine months ended September 30, 2021 and 2020, respectively.