Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Consolidated Statements of Operations [Abstract]
Total revenues	$ 27,509	$ 25,026	$ 87,104	$ 53,405
Costs and expenses
Cost of sales (excludes amortization of intangible assets of $1.7 million, $1.6 million, $3.3 million and $2.4 million, respectively)	12,540	12,237	32,583	24,871
Amortization of inventory fair value adjustment from acquisition		399		1,118
Total cost of sales (excludes amortization of intangible assets of $1.7 million, $1.6 million, $3.3 million and $2.4 million, respectively)	12,540	12,636	32,583	25,989
Research and development	6,450	6,349	14,264	12,624
Sales and marketing	6,254	6,272	12,509	12,271
General and administrative	5,593	4,792	11,352	9,033
Amortization of intangible assets from acquired businesses	1,631	1,467	3,263	2,119
Amortization of intangible assets from licensed technology	144	324	288	648
Business acquisition and integration costs, and restructuring charges		716		2,066
Total costs and expenses	32,612	32,556	74,259	64,750
Operating (loss) income	(5,103)	(7,530)	12,845	(11,345)
Other (expense) income
Interest income	57	11	109	180
Interest expense	(499)	(611)	(1,154)	(1,010)
Total other expense	(442)	(600)	(1,045)	(830)
(Loss) income before taxes	(5,545)	(8,130)	11,800	(12,175)
(Benefit) provision for income taxes	(1,885)	(5,663)	4,012	(7,191)
Net (loss) income	$ (3,660)	$ (2,467)	$ 7,788	$ (4,984)
Basic (loss) earnings per share	$ (0.11)	$ (0.09)	$ 0.24	$ (0.18)
Diluted (loss) earnings per share	$ (0.11)	$ (0.09)	$ 0.24	$ (0.18)
Shares used in basic per share calculation	32,900	28,406	32,675	28,457
Shares used in diluted per share calculation	32,900	28,406	33,110	28,457