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Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2020
Valuation and Qualifying Accounts [Abstract]  
Valuation and Qualifying Accounts
VICOR CORPORATION
SCHEDULE II
VALUATION AND QUALIFYING ACCOUNTS
Years ended December 31, 2020, 2019 and 2018
 
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, 2020
    $ 59,000      $ 23,000     $ —     $ 82,000  
December 31, 2019
      224,000        (144,000 )      (21,000 )      59,000  
December 31, 2018
      159,000        65,000       —       224,000  
 
(1)
Reflects uncollectible accounts written off, net of recoveries.