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Property and Equipment
12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Property and Equipment
(3)
Property and Equipment
Depreciation and amortization of property and equipment is calculated on the straight-line method based on estimated useful lives of the assets. Leasehold improvements are depreciated over the shorter of their useful life or lease term.
 
Property and equipment consist of the following at December 31(in thousands): 
 
    
2020
    
2019
 
Computers and software
   $ 596      $ 572  
Furniture, fixtures, and equipment
     400        299  
Manufacturing and testing equipment
     3,874        3,444  
Construction in process
     120        18  
Leasehold improvements
     932        911  
    
 
 
    
 
 
 
       5,922        5,244  
Less accumulated depreciation
     (3,545      (3,118
    
 
 
    
 
 
 
     $ 2,377      $ 2,126  
    
 
 
    
 
 
 
Depreciation expense was $0.5
 million for the years ended December 31, 2020 and 2019, respectively.