Accrued Warranty

12 Months Ended

Dec. 31, 2019

Product Warranties Disclosures [Abstract]

Accrued Warranty

Note 7—Accrued Warranty

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

	Year ended December 31,
	2019			2018
Balanced at beginning of period	$	112		$	87
Increase in warranty accrual		889			287
Change in liability for pre-existing warranties		(28	)		—
Claims satisfied		(635	)		(262	)
Accrued warranty	$	338		$	112

Warranty expense was $0.9 million and $0.3 million for the years ended December 31, 2019 and 2018, respectively. The year ended December 31, 2019 includes $0.2 million relating to the voluntary recall of catheters, which occurred in September 2019. Warranty expense is included in cost of revenue in the accompanying statements of operations.