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Schedule II - Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2019

SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]

Schedule II - Valuation and Qualifying Accounts

MKS Instruments, Inc.

SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS


						Additions
Description		Balance at Beginning of Year				Acquisition Beginning Balance				Charged to Costs and Expenses				Charged to Other Accounts				Deductions & Write-offs				Balance at End of Year
		(in thousands)
Allowance for doubtful accounts:
Years ended December 31,
2019		$	5,243			$	201			$	(728	)		$	—			$	(2,933	)		$	1,783
2018		$	4,135			$	—			$	1,435			$	—			$	(327	)		$	5,243
2017		$	3,909			$	—			$	825			$	—			$	(599	)		$	4,135


						Additions
Description		Balance at Beginning of Year				Acquisition Beginning Balance				Charged to Costs and Expenses				Charged to Other Accounts				Deductions & Write-offs				Balance at End of Year
		(in thousands)
Allowance for sales returns:
Years ended December 31,
2019		$	1,033			$	—			$	200			$	—			$	162			$	1,395
2018		$	1,295			$	—			$	124			$	—			$	(386	)		$	1,033
2017		$	1,138			$	—			$	(142	)		$	—			$	299			$	1,295


						Additions
Description		Balance at Beginning of Year				Acquisition Beginning Balance				Charged to Costs and Expenses				Charged to Other Accounts				Deductions				Balance at End of Year
		(in thousands)
Valuation allowance on deferred tax asset:
Years ended December 31,
2019		$	17,936			$	5,876			$	4,934			$	—			$	(1,386	)		$	27,360
2018		$	13,629			$	—			$	4,825			$	—			$	(518	)		$	17,936
2017		$	12,527			$	—			$	1,603			$	—			$	(501	)		$	13,629