Condensed Consolidated Statements Of Operations (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
Condensed Consolidated Statements Of Operations [Abstract]
Revenue	$ 41,385	$ 26,301	$ 119,554	$ 74,958
Cost of goods sold	13,633	7,756	43,468	22,288
Gross profit	27,752	18,545	76,086	52,670
Operating costs:
Sales and marketing	9,575	7,473	29,555	23,128
Research and development	4,787	3,344	13,445	9,943
General and administrative	5,468	5,120	15,917	14,467
Amortization of purchased intangible assets	486	106	1,485	329
Total operating costs	20,316	16,043	60,402	47,867
Operating income	7,436	2,502	15,684	4,803
Interest income, net	164	91	404	225
Other income (expense), net	(359)	457	258	659
Income from continuing operations before income taxes	7,241	3,050	16,346	5,687
Provision for income taxes	1,314	867	3,433	1,535
Net income - continuing operations	5,927	2,183	12,913	4,152
Income (loss) from discontinued operations	(3,691)	0	(5,557)	0
Net income	$ 2,236	$ 2,183	$ 7,356	$ 4,152
Basic income (loss) per share:
Continuing operations	$ 0.16	$ 0.06	$ 0.34	$ 0.11
Discontinued operations	$ (0.10)	$ 0.00	$ (0.14)	$ 0.00
Total net income per share	$ 0.06	$ 0.06	$ 0.20	$ 0.11
Diluted income (loss) per share:
Continuing operations	$ 0.15	$ 0.06	$ 0.33	$ 0.11
Discontinued operations	$ (0.09)	$ 0.00	$ (0.14)	$ 0.00
Total net income per share	$ 0.06	$ 0.06	$ 0.19	$ 0.11
Weighted average common shares outstanding:
Basic	37,539	37,417	37,531	37,411
Diluted	38,606	38,159	38,610	38,216