Other Financial Statement Data (Tables)

9 Months Ended

Sep. 30, 2017

Balance Sheet Related Disclosures [Abstract]

Schedule of Inventory Components

The components of our inventories are as follows:

(In thousands)	September 30, 2017		December 31, 2016
Raw materials and purchased parts	$	8,022	$	6,475
Work in process	1,640		826
Finished goods	6,972		4,230
Total inventories	$	16,634	$	11,531

Schedule of Accrued Liabilities

The components of our accrued expenses are as follows:

(In thousands)	September 30, 2017		December 31, 2016
Wages and benefits	$	959	$	2,673
Warranty liability	691		717
Other	364		366
	$	2,014	$	3,756

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)	2017			2016
Balance at beginning of period	$	790		$	645
Accrual for warranties	362			615
Warranty revision	(23		)	(27		)
Settlements made during the period	(413		)	(415		)
Balance at end of period	716			818
Current portion of estimated warranty liability	(691		)	(736		)
Long-term estimated warranty liability	$	25		$	82

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)	2017			2016
Balance at beginning of period	$	346		$	199
Revenue deferrals	321			490
Amortization of deferred revenue	(325		)	(330		)
Total deferred warranty revenue	342			359
Current portion of deferred warranty revenue	(301		)	(278		)
Long-term deferred warranty revenue	$	41		$	81