SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS

12 Months Ended

Dec. 31, 2016

Valuation and Qualifying Accounts [Abstract]

SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS

	Years Ended December 31,
	2016			2015			2014
				(in thousands)
Allowance for bad debts:
Beginning balance	$	605		$	490		$	294
Additions		344			379			354
Write-offs		(306	)		(264	)		(158	)
Ending balance	$	643		$	605		$	490
Allowance for customer credits:
Beginning balance	$	439		$	280		$	111
Additions		592			803			1,037
Write-offs		(660	)		(644	)		(868	)
Ending balance	$	371		$	439		$	280
Tax valuation allowance:
Beginning balance	$	5,427		$	6,015		$	6,356
Charged (credited) to tax expense		(771	)		(588	)		(341	)
Ending balance	$	4,656		$	5,427		$	6,015