Condensed Consolidated Statements of Operations (unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenue:
Product revenue	$ 18,658	$ 21,495	$ 34,665	$ 40,963
Service revenue	2,926	3,024	5,801	5,741
Total revenue	21,584	24,519	40,466	46,704
Cost of Revenue:
Cost of product	10,285	11,632	17,880	21,249
Cost of services	1,228	928	2,712	1,952
Total cost of revenue	11,513	12,560	20,592	23,201
Gross profit	10,071	11,959	19,874	23,503
Operating expenses:
Product development and engineering	5,125	5,310	10,469	10,435
Selling, general and administrative	7,007	7,379	15,024	15,115
Total operating expenses	12,132	12,689	25,493	25,550
Operating loss	(2,061)	(730)	(5,619)	(2,047)
Interest expense	0	(22)	0	(36)
Other income (expense), net	74	(296)	(203)	(215)
Loss from continuing operations before provision for income taxes	(1,987)	(1,048)	(5,822)	(2,298)
Provision for income taxes	36	77	97	127
Loss from continuing operations	(2,023)	(1,125)	(5,919)	(2,425)
Income from discontinued operations, net of income taxes of $675 and $813 in 2015	0	844	0	1,076
Net loss	$ (2,023)	$ (281)	$ (5,919)	$ (1,349)
Net income (loss) per share — basic
From continuing operations (usd per share)	$ (0.29)	$ (0.16)	$ (0.84)	$ (0.34)
From discontinued operations (usd per share)	0.00	0.12	0.00	0.15
Net loss per share — basic (usd per share)	(0.29)	(0.04)	(0.84)	(0.19)
Net income (loss) per share — diluted
From continuing operations (usd per share)	(0.29)	(0.16)	(0.84)	(0.34)
From discontinued operations (usd per share)	0.00	0.12	0.00	0.15
Net loss per share — diluted (usd per share)	$ (0.29)	$ (0.04)	$ (0.84)	$ (0.19)
Weighted average number of shares:
Basic (shares)	7,092	6,988	7,042	7,059
Diluted (shares)	7,092	6,988	7,042	7,059