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Property and Equipment, Net
 12 Months Ended
Dec. 31, 2021
Property Plant And Equipment [Abstract]  
Property and Equipment, Net

NOTE 6. Property and Equipment, Net

Property and equipment, net consisted of the following:

 

 

 

December 31,

 

(in thousands)

 

2021

 

 

2020

 

Research equipment

 

$

6,735

 

 

$

5,539

 

Computers and software

 

 

488

 

 

 

284

 

Office equipment and furniture

 

 

574

 

 

 

574

 

Leasehold improvements

 

 

44

 

 

 

44

 

Construction in progress

 

 

2,058

 

 

 

—

 

Total

 

$

9,899

 

 

$

6,441

 

Less accumulated depreciation and amortization

 

 

(4,256

)

 

 

(3,063

)

Property and equipment, net

 

$

5,643

 

 

$

3,378

 

 

Depreciation and amortization expense was $1.2 million , $0.9 million and $0.7 million for the years ended December 31, 2021, 2020 and 2019, respectively.