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Valuation and Qualifying Accounts
12 Months Ended
Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract]  
Valuation and Qualifying Accounts

VICOR CORPORATION

SCHEDULE II

VALUATION AND QUALIFYING ACCOUNTS

Years ended December 31, 2017, 2016, and 2015

 

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, 2017

   $ 153,000    $ 6,000   $     $ 159,000

December 31, 2016

     171,000      (22,000     4,000     153,000

December 31, 2015

     183,000      18,000     (30,000     171,000

 

(1) Reflects uncollectible accounts written off, net of recoveries.