CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Revenues:
Product revenues	$ 69,236	$ 48,524
Services and other revenues	17,874	15,619
Total revenues	87,110	64,143
Cost of revenues:
Cost of product revenues	33,547	20,296
Cost of services and other revenues	8,196	8,098
Total cost of revenues	41,743	28,394
Gross profit	45,367	35,749
Operating expenses:
Research and development	7,954	6,494
Selling, general and administrative	33,244	25,620
Total operating expenses	41,198	32,114
Income from operations	4,169	3,635
Interest and other income (expense), net	(223)	96
Income before provision for income taxes	3,946	3,731
Provision for income taxes	561	1,380
Net income	$ 3,385	$ 2,351
Net income per share:
Net income per share-basic	$ 0.10	$ 0.07
Net income per share - diluted	$ 0.10	$ 0.07
Weighted average shares outstanding:
Basic (in shares)	33,900	33,365
Diluted (in shares)	34,820	34,341