Condensed Consolidated Statements Of Operations And Comprehensive Income (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Revenue:
Products	$ 33,248	$ 28,742	$ 95,002	$ 75,783
Services	24,290	12,761	65,561	32,490
Total revenue	57,538	41,503	160,563	108,273
Cost of sales:
Products	16,010	14,765	45,732	38,381
Services	13,765	7,910	38,667	20,787
Total cost of sales	29,775	22,675	84,399	59,168
Gross profit	27,763	18,828	76,164	49,105
Operating expenses:
Selling, general and administrative	15,100	10,960	42,224	29,894
Research and development	3,872	2,708	9,737	7,979
Total operating expenses	18,972	13,668	51,961	37,873
Income from operations	8,791	5,160	24,203	11,232
Interest and other expense (income), net	654	(492)	465	342
Income before income taxes	8,137	5,652	23,738	10,890
Provision for (benefit of) income taxes	917	284	(3,677)	767
Net income	7,220	5,368	27,415	10,123
Other comprehensive income
Unrealized gain (loss) on pension obligation	(5)	14		(6)
Foreign currency translation gain (loss)	(2,873)	1,831	(250)	557
Comprehensive income	$ 4,342	$ 7,213	$ 27,165	$ 10,674
Net income per share - basic	$ 0.14	$ 0.12	$ 0.55	$ 0.22
Net income per share - diluted	$ 0.14	$ 0.11	$ 0.54	$ 0.22