Statements of Operations (unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Revenue:
Product revenue	$ 28,072		$ 23,442
Service revenue	10,833		9,973
Total revenue	38,905		33,415
Cost of sales	25,878		20,734
Gross profit	13,027		12,681
Operating expenses:
Product development and engineering	4,648		3,699
Selling, general and administrative	12,392		12,627
Total operating expenses	17,040		16,326
Operating loss	(4,013)		(3,645)
Interest expense	(132)		(208)
Other income (loss), net	17		162
Loss from continuing operations before income taxes	(4,128)		(3,691)
Provision (benefit) for income taxes	306		(1,517)
Loss from continuing operations	(4,434)		(2,174)
Income from discontinued operations, net of income taxes of $0 in 2013 and $2,293 in 2012	0		5,786
Net income (loss)	$ (4,434)		$ 3,612
Net loss per share — basic (1):
From continuing operations (in usd per share)	$ (0.59)	[1]	$ (0.28)	[1]
From discontinued operations (in usd per share)	$ 0.00	[1]	$ 0.73	[1]
Net income (loss) per share — basic (in usd per share)	$ (0.59)	[1]	$ 0.45	[1]
Net Income (loss) per share — diluted (1):
From continuing operations (in usd per share)	$ (0.59)	[1]	$ (0.28)	[1]
From discontinued operations (in usd per share)	$ 0.00	[1]	$ 0.73	[1]
Net income (loss) per share — diluted (in usd per share)	$ (0.59)	[1]	$ 0.45	[1]
Weighted average number of shares:
Basic (in shares)	7,568		7,887
Diluted (in shares)	7,568		7,896

[1] Amounts may not add due to rounding.