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Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2018
Valuation and Qualifying Accounts [Abstract]  
Valuation and Qualifying Accounts
 
VICOR CORPORATION

SCHEDULE II

VALUATION AND QUALIFYING ACCOUNTS

Years ended December 31, 2018, 2017 and 2016

 
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, 2018
 
$
159,000
 
 
$
65,000
 
 
$
—
 
 
$
224,000
 
December 31, 2017
 
 
153,000
 
 
 
6,000
 
 
 
—
 
 
 
159,000
 
December 31, 2016
 
 
171,000
 
 
 
(22,000
)
 
 
4,000
 
 
 
153,000
 
 
 
(1)
Reflects uncollectible accounts written off, net of recoveries.