Other Financial Statement Data (Tables)

9 Months Ended

Sep. 30, 2018

Balance Sheet Related Disclosures [Abstract]

Schedule of Inventory Components

The components of our inventories were as follows:

(In thousands)	September 30, 2018		December 31, 2017
Raw materials and purchased parts	$	7,383	$	7,383
Work in process	1,633		1,666
Finished goods	4,919		5,344
Total inventories	$	13,935	$	14,393

Schedule of Accrued Liabilities

The components of our accrued expenses were as follows:

(In thousands)	September 30, 2018		December 31, 2017
Wages and benefits	$	1,607	$	1,328
Warranty liability	713		713
Other	336		244
	$	2,656	$	2,285

Schedule of Changes In Estimated Warranty Liability

A reconciliation of the changes in our estimated warranty liability is as follows:

	Nine Months Ended September 30,
(In thousands)	2018			2017
Balance at beginning of period	$	767		$	790
Accrual for warranties	399			362
Warranty revision	(30		)	(23		)
Settlements made during the period	(368		)	(413		)
Balance at end of period	768			716
Current portion of estimated warranty liability	(713		)	(691		)
Long-term estimated warranty liability	$	55		$	25

Schedule Of Changes In Deferred Warranty Revenue

A reconciliation of the changes in our deferred warranty revenue is as follows:

	Nine Months Ended September 30,
(In thousands)	2018			2017
Balance at beginning of period	$	259		$	346
Revenue deferrals	289			321
Amortization of deferred revenue	(310		)	(325		)
Total deferred warranty revenue	238			342
Current portion of deferred warranty revenue	(228		)	(301		)
Long-term deferred warranty revenue	$	10		$	41