Product Warranty Liability

9 Months Ended

Sep. 30, 2023

Warranty Liability [Abstract]

Product Warranty Liability

8. Product Warranty Liability

Changes in warranty liability were as follows (in thousands):

	Amount
Balance as of December 31, 2022	$	2,478
Utilization		(62	)
Balance as of March 31, 2023	$	2,416
Reversal of product warranty accrual		(45	)
Utilization		(25	)
Balance as of June 30, 2023	$	2,346
Reversal of product warranty accrual		(72	)
Utilization		(21	)
Balance as of September 30, 2023	$	2,253

The assumptions utilized in developing the liability as of September 30, 2023, include an estimated cost per unit of $6 thousand, an average battery life of 5 years, inflationary increase of 3.6%, and an average patient life calculated based on probabilities outlined in the PRI-2012 mortality tables, published from the Society of Actuaries. Additionally, a discount rate of 5.0% was used in the calculation as of September 30, 2023.