Condensed Consolidated Statements of Operations (unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013	Jun. 30, 2012
Revenue:
Product revenue	$ 26,432		$ 26,598		$ 54,504	$ 50,040
Service revenue	11,743		11,028		22,576	21,001
Total revenue	38,175		37,626		77,080	71,041
Cost of sales	24,803		24,314		50,681	45,048
Gross profit	13,372		13,312		26,399	25,993
Operating expenses:
Product development and engineering	4,454		3,389		9,102	7,088
Selling, general and administrative	9,453		11,167		21,845	23,794
Total operating expenses	13,907		14,556		30,947	30,882
Operating loss	(535)		(1,244)		(4,548)	(4,889)
Interest expense	(241)		(191)		(373)	(399)
Gain from settlement of deferred consideration obligation	0		2,314		0	2,314
Other (loss) income, net	(102)		(82)		(85)	80
Income (loss) from continuing operations before income taxes	(878)		797		(5,006)	(2,894)
Provision (benefit) for income taxes	115		296		421	(1,221)
Income (loss) from continuing operations	(993)		501		(5,427)	(1,673)
Income (loss) from discontinued operations, net of income taxes of $0 in 2013 and $2,542 in 2012	0		(2,615)		0	3,171
Net income (loss)	$ (993)		$ (2,114)		$ (5,427)	$ 1,498
Net income (loss) per share — basic (1):
From continuing operations (in usd per share)	$ (0.13)	[1]	$ 0.06	[1]	$ (0.72)	$ (0.21)
From discontinued operations (in usd per share)	$ 0.00	[1]	$ (0.33)	[1]	$ 0.00	$ 0.40
Net income (loss) per share — basic (in usd per share)	$ (0.13)	[1]	$ (0.27)	[1]	$ (0.72)	$ 0.19
Net Income (loss) per share — diluted (1):
From continuing operations (in usd per share)	$ (0.13)	[1]	$ 0.06	[1]	$ (0.72)	$ (0.21)
From discontinued operations (in usd per share)	$ 0.00	[1]	$ (0.33)	[1]	$ 0.00	$ 0.40
Net income (loss) per share — diluted (in usd per share)	$ (0.13)	[1]	$ (0.27)	[1]	$ (0.72)	$ 0.19
Weighted average number of shares:
Basic (in shares)	7,585		7,887		7,570	7,887
Diluted (in shares)	7,585		7,887		7,570	7,899

[1] Amounts may not add due to rounding.