Condensed Consolidated Statements Of Operations And Comprehensive Income (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Revenue:
Products	$ 32,610	$ 24,645	$ 61,754	$ 47,042
Services	22,518	10,499	41,271	19,729
Total revenue	55,128	35,144	103,025	66,771
Cost of sales:
Products	15,971	12,614	29,723	23,617
Services	13,954	6,574	24,902	12,877
Total cost of sales	29,925	19,188	54,625	36,494
Gross profit	25,203	15,956	48,400	30,277
Operating expenses:
Selling, general and administrative	14,159	9,776	27,123	18,934
Research and development	3,043	2,766	5,865	5,271
Total operating expenses	17,202	12,542	32,988	24,205
Income from operations	8,001	3,414	15,412	6,072
Interest and other expense (income), net	107	430	(189)	834
Income before income taxes	7,894	2,984	15,601	5,238
Provision for (benefit of) income taxes	(5,479)	247	(4,594)	483
Net income	13,373	2,737	20,195	4,755
Other comprehensive income
Gain on pension plan-unrealized	2	(13)	5	(20)
Foreign currency translation adjustments	1,501	(760)	2,622	(1,274)
Comprehensive income	$ 14,876	$ 1,964	$ 22,822	$ 3,461
Net income per share - basic	$ 0.27	$ 0.06	$ 0.41	$ 0.10
Net income per share - diluted	$ 0.26	$ 0.06	$ 0.40	$ 0.10