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Property, Plant and Equipment
3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Property, Plant and Equipment    
Property, Plant and Equipment

6.Property, Plant and Equipment

Property, plant and equipment consisted of the following:

    

March 31,

    

December 31,

(in thousands)

2022

2021

Furniture and fixtures

$

173

$

173

Office and computer equipment

 

5,638

 

5,638

Software

 

16,423

 

15,227

Test equipment

 

347

 

347

Leasehold improvements

 

2,689

 

2,689

 

25,270

 

24,074

Less: Accumulated depreciation

 

(21,209)

 

(20,632)

Add: Assets under development

 

1,508

 

1,518

Net property, plant and equipment

$

5,569

$

4,960

4.

Property, Plant and Equipment

Property, plant and equipment consisted of the following at December 31:

    

2021

    

2020

Furniture and fixtures

$

173

$

173

Office and computer equipment

 

5,638

 

5,436

Software

 

15,227

 

13,251

Test equipment

 

347

 

347

Leasehold improvements

 

2,689

 

2,689

 

24,074

 

21,896

Less: Accumulated depreciation

 

(20,632)

 

(18,614)

Add: Assets under development

 

1,518

 

1,743

Net property, plant and equipment

$

4,960

$

5,025