Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2017

Valuation And Qualifying Accounts [Abstract]

Valuation and Qualifying Accounts

Schedule II-A—Valuation and Qualifying Accounts

Allowance for Doubtful Accounts Receivable (in thousands)

	Balance at		Additions Charged to					Balance at
Fiscal Year Ended	Beginning of Period		Costs and Expenses		Deductions			End of Period
December 31, 2017	$	42	$	31	$	(27	)	$	46
December 31, 2016	$	423	$	3	$	(384	)	$	42
December 31, 2015	$	166	$	332	$	(75	)	$	423

Inventory Reserve (in thousands)

	Balance at							Balance at
Fiscal Year Ended	Beginning of Period		Additions		Deductions			End of Period
December 31, 2017	$	3,594		—	$	(457	)	$	3,137
December 31, 2016	$	4,020		—	$	(426	)	$	3,594
December 31, 2015	$	2,995	$	1,025		—		$	4,020

See accompanying report of independent registered public accounting firm on page 41 of this annual report.