Condensed Consolidated Statements of Operations (unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenue:
Product revenue	$ 16,063	$ 20,847	$ 50,728	$ 61,809
Service revenue	2,884	2,086	8,685	7,828
Total revenue	18,947	22,933	59,413	69,637
Cost of Revenue:
Cost of product	8,868	9,758	26,748	31,007
Cost of services	1,113	1,061	3,825	3,013
Total cost of revenue	9,981	10,819	30,573	34,020
Gross profit	8,966	12,114	28,840	35,617
Operating expenses:
Product development and engineering	4,937	4,901	15,406	15,336
Selling, general and administrative	6,931	7,281	21,955	22,396
Total operating expenses	11,868	12,182	37,361	37,732
Operating loss	(2,902)	(68)	(8,521)	(2,115)
Interest expense	(7)	(11)	(35)	(48)
Other income (expense), net	(173)	188	(348)	(26)
Income (loss) from continuing operations before provision for income taxes	(3,082)	109	(8,904)	(2,189)
Provision (benefit) for income taxes	31	(39)	128	88
Income (loss) from continuing operations	(3,113)	148	(9,032)	(2,277)
Income from discontinued operations, net of income taxes of $490 and $1,303 in 2015	0	738	0	1,814
Net income (loss)	$ (3,113)	$ 886	$ (9,032)	$ (463)
Net income (loss) per share — basic
From continuing operations (usd per share)	$ (0.45)	$ 0.02	$ (1.31)	$ (0.33)
From discontinued operations (usd per share)	0.00	0.11	0.00	0.26
Net income (loss) per share — basic (usd per share)	(0.45)	0.13	(1.31)	(0.07)
Net income (loss) per share — diluted
From continuing operations (usd per share)	(0.45)	0.02	(1.31)	(0.33)
From discontinued operations (usd per share)	0.00	0.11	0.00	0.26
Net income (loss) per share — diluted (usd per share)	$ (0.45)	$ 0.13	$ (1.31)	$ (0.07)
Weighted average number of shares:
Basic (shares)	6,868	6,978	6,912	7,032
Diluted (shares)	6,868	7,014	6,912	7,032