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

 

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

 

    As of December 31,  
    2021     2020  
             
Computers, software, furniture and fixtures   $ 1,484     $ 1,591  
Equipment under finance leases     3,463       3,806  
Less accumulated depreciation and amortization     (4,571 )     (4,394 )
Property and equipment, net   $ 376     $ 1,003  

 

Depreciation and amortization expense was $0.6 million and $0.8 million for the years ended December 31, 2021 and 2020, respectively.