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Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2019
Valuation and Qualifying Accounts [Abstract]  
Valuation and Qualifying Accounts
VICOR CORPORATION
SCHEDULE II
VALUATION AND QUALIFYING ACCOUNTS
Years ended December 31, 2019, 2018 and 2017
Description
 
Balance at
Beginning
of Period
 
  
Charge
(Recovery)
to Costs and
Expenses
 
  
Other Charges,
Deductions (1)
 
  
Balance at
End of Period
 
Allowance for doubtful accounts:
   
     
     
     
 
Year ended:
   
     
     
     
 
December 31, 2019
  $
224,000
     $
(144,000
 )   $
(21,000
 )   $
59,000
  
December 31, 2018
   
159,000
      
65,000
      
—
      
224,000
  
December 31, 2017
   
153,000
      
6,000
      
—
      
159,000
  
 
(1) Reflects uncollectible accounts written off, net of recoveries.