CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Revenues:
Product revenues	$ 48,524	$ 42,575
Services and other revenues	15,619	14,585
Total revenues	64,143	57,160
Cost of revenues:
Cost of product revenues	20,296	17,836
Cost of services and other revenues	8,098	7,674
Total cost of revenues	28,394	25,510
Gross profit	35,749	31,650
Operating expenses:
Research and development	6,494	4,840
Selling, general and administrative	25,620	25,781
Total operating expenses	32,114	30,621
Income from operations	3,635	1,029
Interest and other income (expense), net	96	54
Income before provision for income taxes	3,731	1,083
Provision for income taxes	1,380	413
Net income	$ 2,351	$ 670
Net income per share-basic (in dollars per share)	$ 0.07	$ 0.02
Net income per share-diluted (in dollars per share)	$ 0	$ 0.02
Weighted average shares outstanding:
Basic (in shares)	33,365	33,184
Diluted (in shares)	34,341	34,098