Condensed Consolidated Statements of Operations (unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenue:
Product revenue	$ 30,671	$ 26,432	$ 62,215	$ 54,504
Service revenue	12,453	11,743	23,227	22,576
Total revenue	43,124	38,175	85,442	77,080
Cost of sales	28,342	24,803	57,409	50,681
Gross profit	14,782	13,372	28,033	26,399
Operating expenses:
Product development and engineering	5,392	4,454	10,970	9,102
Selling, general and administrative	10,516	9,453	22,038	21,845
Total operating expenses	15,908	13,907	33,008	30,947
Operating loss	(1,126)	(535)	(4,975)	(4,548)
Interest expense	(40)	(241)	(190)	(373)
Other expense, net	(420)	(102)	(387)	(85)
Loss before provision for income taxes	(1,586)	(878)	(5,552)	(5,006)
Provision for income taxes	681	115	932	421
Net Loss	$ (2,267)	$ (993)	$ (6,484)	$ (5,427)
Net loss per share — basic (in usd per share)	$ (0.31)	$ (0.13)	$ (0.89)	$ (0.72)
Net loss per share — diluted (in usd per share)	$ (0.31)	$ (0.13)	$ (0.89)	$ (0.72)
Weighted average number of shares:
Basic (in shares)	7,360	7,585	7,322	7,570
Diluted (in shares)	7,360	7,585	7,322	7,570