Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Sales:
Product	$ 20,331	$ 24,529	$ 71,433	$ 62,653
Service	19,885	14,293	51,907	34,916
Net sales	40,216	38,822	123,340	97,569
Costs and expenses:
Costs of product sales	11,780	13,297	39,999	37,026
Costs of service sales	11,909	10,035	33,019	22,659
Research and development	3,334	2,949	9,534	9,148
Sales, marketing and support	6,344	6,360	20,828	17,239
General and administrative	4,774	3,040	13,084	8,906
Total costs and expenses	38,141	35,681	116,464	94,978
Income from operations	2,075	3,141	6,876	2,591
Interest income	199	147	572	359
Interest expense	189	76	450	243
Other income, net	212	23	290	99
Income before income tax expense	2,297	3,235	7,288	2,806
Income tax expense	911	1,490	2,390	1,983
Net income	$ 1,386	$ 1,745	$ 4,898	$ 823
Net income per share
Basic	$ 0.09	$ 0.12	$ 0.32	$ 0.06
Diluted	$ 0.09	$ 0.12	$ 0.32	$ 0.05
Number of shares used in per share calculation:
Basic	15,199,802	14,846,249	15,109,311	14,742,855
Diluted	15,354,459	15,023,580	15,300,118	14,971,667