Accrued product warranty liability

3 Months Ended

Mar. 31, 2018

Accrued product warranty liability [Abstract]

Accrued product warranty liability

3. Accrued product warranty liability

We generally warrant our products for up to 36 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, 2018 and 2017:

	Three Months Ended March 31,
	2018				2017
	(In thousands)
Balance, beginning of period		$	267			$	267
Warranties issued			80				55
Warranty settlements			(69	)			(65	)
Balance, end of period		$	278			$	257

As of March 31, 2018, $196 thousand of the accrued product warranty liability is classified as current in "Accrued liabilities" in the Condensed Consolidated Balance Sheets and the remaining $82 thousand is classified as non-current in "Other liabilities".