Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Statement [Abstract]
Total revenues	$ 40,857	$ 33,539	$ 119,018	$ 125,240
Costs and expenses
Cost of sales (excludes amortization of intangible assets of $1,571, $1,547, $4,713 and $4,496, respectively)	16,768	15,297	52,917	48,297
Research and development	11,506	7,462	28,714	22,896
Sales and marketing	11,060	8,658	30,380	24,162
General and administrative	5,879	5,622	18,949	18,828
Amortization of intangible assets from acquired businesses and technology	2,207	2,171	6,623	5,957
Impairment loss	3,558	0	3,558	0
Facility restructuring charge	0	124	0	493
Total costs and expenses	50,978	39,334	141,141	120,633
Operating (loss) income	(10,121)	(5,795)	(22,123)	4,607
Interest expense, net	(224)	(361)	(955)	(1,084)
(Loss) income before taxes	(10,345)	(6,156)	(23,078)	3,523
Benefit for income taxes	(4,578)	(1,795)	(8,891)	(2,728)
Net (loss) income	$ (5,767)	$ (4,361)	$ (14,187)	$ 6,251
Basic (loss) earnings per share	$ (0.17)	$ (0.13)	$ (0.41)	$ 0.18
Diluted (loss) earnings per share	$ (0.17)	$ (0.13)	$ (0.41)	$ 0.18
Shares used in basic per share calculation	34,480	33,975	34,340	33,774
Shares used in diluted per share calculation	34,480	33,975	34,340	34,834