Accrued product warranty liability

3 Months Ended

Mar. 31, 2019

Accrued product warranty liability [Abstract]

Accrued product warranty liability

4. Accrued product warranty liability

We generally warrant our products for up to 24 months and record the estimated cost of such product warranties at the time the sale is recorded. Estimated warranty costs are based upon actual past experience of product repairs and the related estimated cost of labor and material to make the necessary repairs.

The following table summarizes the activity recorded in the accrued product warranty liability during the three months ended March 31, 2019 and 2018:

	Three Months Ended March 31,
	2019			2018
	(In thousands)
Balance, beginning of period	$	273		$	267
Warranties issued		40			80
Warranty settlements		(60	)		(69	)
Balance, end of period	$	253		$	278

As of March 31, 2019, $199 thousand of the accrued product warranty liability were classified as current in "Accrued liabilities" in the Condensed Consolidated Balance Sheets and the remaining $54 thousand was classified as non-current in "Other liabilities".