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Property and Equipment
12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment [Abstract]  
Property and Equipment

7.    Property and Equipment

Property and equipment consisted of the following at December 31, 2018 and 2019 (in thousands):

 

 

 

 

 

 

 

 

 

 

 

 

 

 

December 31, 

 

    

Lives in years

    

2018

    

2019

Leasehold improvements

 

5 to 15

 

$

807

 

$

824

Research and laboratory equipment

 

3 to 5

 

 

4,209

 

 

4,287

Office equipment and furniture

 

3 to 5

 

 

1,140

 

 

1,169

 

 

 

 

 

6,156

 

 

6,280

Less: accumulated depreciation and amortization

 

  

 

 

(6,120)

 

 

(6,253)

 

 

 

 

$

36

 

$

27

 

Depreciation and amortization expense for property and equipment was $29,000 and $20,000 for the years ended December 31, 2018 and 2019, respectively. The Company sold fully depreciated assets for proceeds of $16,000 and $38,000 during the years ended December 31, 2018 and 2019, respectively.