CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenues:
Product revenues	$ 75,581	$ 59,269	$ 144,817	$ 107,793
Services and other revenues	18,105	16,115	35,979	31,734
Total revenues	93,686	75,384	180,796	139,527
Cost of revenues:
Cost of product revenues	36,286	28,600	69,833	48,896
Cost of services and other revenues	8,032	7,408	16,228	15,506
Total cost of revenues	44,318	36,008	86,061	64,402
Gross profit	49,368	39,376	94,735	75,125
Operating expenses:
Research and development	7,150	5,499	15,104	11,993
Selling, general and administrative	32,859	31,446	66,104	57,066
Total operating expenses	40,009	36,945	81,208	69,059
Income from operations	9,359	2,431	13,527	6,066
Interest and other income (expense), net	63	(73)	(159)	23
Income before provision for income taxes	9,422	2,358	13,368	6,089
Provision for income taxes	3,406	983	3,967	2,363
Net income	$ 6,016	$ 1,375	$ 9,401	$ 3,726
Net income per share:
Net income per share-basic	$ 0.17	$ 0.04	$ 0.28	$ 0.11
Net income per share - diluted	$ 0.17	$ 0.04	$ 0.27	$ 0.11
Weighted average shares outstanding:
Basic (in shares)	34,450	33,390	34,177	33,377
Diluted (in shares)	35,374	34,316	35,099	34,329