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Property and Equipment
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Property and Equipment [Abstract]    
Property and Equipment

(4) Property and Equipment

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

 

Estimated
Life

  

March 31,
2024

  

December 31,
2023

Computer equipment

  

3 years

  

$

39

 

  

$

39

 

Lab equipment

  

5 years

  

 

130

 

  

 

130

 

Furniture and fixtures

  

5 years

  

 

37

 

  

 

37

 

Computer software

  

3 years

  

 

16

 

  

 

16

 
       

 

222

 

  

 

222

 

Accumulated depreciation and amortization

      

 

(215

)

  

 

(212

)

Property and equipment, net

      

$

7

 

  

$

10

 

For the three months ended March 31, 2024 and 2023, depreciation and amortization expense was $3,000 and $4,000 respectively.

(4) Property and Equipment

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

 

Estimated
Life

  

December 31,
2023

  

December 31,
2022

Computer equipment

  

3 years

  

$

39

 

  

$

39

 

Lab equipment

  

5 years

  

 

130

 

  

 

130

 

Furniture and fixtures

  

5 years

  

 

37

 

  

 

44

 

Computer software

  

3 years

  

 

16

 

  

 

16

 
       

 

222

 

  

 

229

 

Accumulated depreciation and amortization

      

 

(212

)

  

 

(204

)

Property and equipment, net

      

$

10

 

  

$

25

 

For the years ended December 31, 2023 and 2022, depreciation and amortization expense was $15,000 and $20,000, respectively.