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

3. Property and Equipment

Property and equipment consist of the following (in thousands):

 

As of December 31,

 

 

2021

 

 

2020

 

Machinery and equipment

$

1,610

 

 

$

1,661

 

Computer equipment and software

 

243

 

 

 

241

 

Office equipment

 

104

 

 

 

230

 

Leasehold improvements

 

549

 

 

 

1,303

 

Construction in progress

 

1

 

 

 

3

 

 

 

2,507

 

 

 

3,438

 

Less: accumulated depreciation and amortization

 

(2,123

)

 

 

(2,904

)

Property and equipment, net

$

384

 

 

$

534

 

Depreciation and amortization expense for the years ended December 31, 2021 and 2020 was $171 thousand and $162 thousand, respectively. During the year ended December 31, 2021, the Company disposed of approximately $1.0 million in property and equipment that had been depreciated and amortized in full and had no impact on the accompanying consolidated statements of operations.