Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2016

Valuation and Qualifying Accounts [Abstract]

Valuation and Qualifying Accounts

VICOR CORPORATION

SCHEDULE II

VALUATION AND QUALIFYING ACCOUNTS

Years ended December 31, 2016, 2015 and 2014

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, 2016	$	171,000	$	(22,000	)	$	4,000		$	153,000
December 31, 2015		183,000		18,000			(30,000	)		171,000
December 31, 2014		198,000		66,000			(81,000	)		183,000

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