Condensed Consolidated Statements of Operations (Unaudited) (USD $)	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Revenue	$ 51,470,000		$ 50,484,000
Cost of revenue (1)	24,085,000	[1]	24,074,000	[1]
Gross profit	27,385,000		26,410,000
Operating expenses:
Research and development (1)	12,123,000	[2]	11,118,000	[2]
Selling, general and administrative (1)	13,258,000	[3]	11,966,000	[3]
Litigation expense (benefit)	(301,000)		128,000
Total operating expenses	25,080,000		23,212,000
Income from operations	2,305,000		3,198,000
Interest income (expense) and other, net	(10,000)		106,000
Income before income taxes	2,295,000		3,304,000
Income tax provision (benefit)	(204,000)		309,000
Net income	2,499,000		2,995,000
Basic net income per share (in Dollars per share)	$ 0.07		$ 0.09
Diluted net income per share (in Dollars per share)	$ 0.07		$ 0.08
Weighted average common shares outstanding:
Basic (in Shares)	36,259		34,105
Diluted (in Shares)	37,708		35,538
(1) Includes stock-based compensation as follows:
Stock-based compensation	4,660,000		3,315,000
Cost Of Revenue [Member]
(1) Includes stock-based compensation as follows:
Stock-based compensation	156,000		95,000
Research and Development [Member]
(1) Includes stock-based compensation as follows:
Stock-based compensation	1,373,000		1,266,000
Selling, General And Administrative [Member]
(1) Includes stock-based compensation as follows:
Stock-based compensation	$ 3,131,000		$ 1,954,000

[1] (1) Includes stock-based compensation expense

[2] (2) Includes stock-based compensation expense

[3] (3) Includes stock-based compensation expense