Accrued Warranty (Tables)

12 Months Ended

Dec. 31, 2018

Product Warranties Disclosures [Abstract]

Schedule Product Warranty Accrual Included in Accrued Expenses

Activity in the product warranty accrual is included in accrued expenses above and consists of the following (in thousands):

	Year ended December 31,
	2018			2017
Balanced at beginning of period	$	87		$	97
Increase in warranty accrual		287			198
Claims satisfied		(262	)		(208	)
Accrued warranty	$	112		$	87