CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenues:
Product revenues	$ 67,446	$ 49,790	$ 175,239	$ 138,583
Services and other revenues	16,885	14,649	48,619	44,021
Total revenues	84,331	64,439	223,858	182,604
Cost of revenues:
Cost of product revenues	30,636	22,429	79,532	59,995
Cost of services and other revenues	7,608	7,562	23,114	22,704
Total cost of revenues	38,244	29,991	102,646	82,699
Gross profit	46,087	34,448	121,212	99,905
Operating expenses:
Research and development	5,545	6,019	17,538	16,139
Selling, general and administrative	29,316	23,635	86,382	73,713
Total operating expenses	34,861	29,654	103,920	89,852
Income from operations	11,226	4,794	17,292	10,053
Interest and other income (expense), net	34	(191)	57	(66)
Income before provision for income taxes	11,260	4,603	17,349	9,987
Provision for income taxes	4,340	1,609	6,703	3,736
Net income	$ 6,920	$ 2,994	$ 10,646	$ 6,251
Net income per share:
Net income per share-basic	$ 0.21	$ 0.09	$ 0.32	$ 0.19
Net income per share - diluted	$ 0.20	$ 0.09	$ 0.31	$ 0.18
Weighted average shares outstanding:
Basic (in shares)	33,193	33,209	33,316	33,132
Diluted (in shares)	34,068	34,219	34,241	34,100