Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenue	$ 196,519	$ 218,840	$ 165,008
Cost of revenue	94,925	97,383	67,330
Gross profit	101,594	121,457	97,678
Operating expenses:
Research and development	44,518	44,372	38,295
Selling, general and administrative	40,280	41,169	36,752
Total operating expenses	88,177	90,959	78,148
Income from operations	13,417	30,498	19,530
Other income (expense):
Interest and other income	671	1,156	1,047
Other expense	(362)	(234)	(429)
Total other income, net	309	922	618
Income before income taxes	13,726	31,420	20,148
Income tax provision	425	1,857	474
Net income	13,301	29,563	19,674
Basic income per share (in Dollars per share)	$ 0.39	$ 0.83	$ 0.57
Diluted income per share (in Dollars per share)	$ 0.38	$ 0.78	$ 0.54
Weighted-average common shares outstanding (in Shares)	34,050	35,830	34,310
Stock options and restricted stock	1,110	1,996	2,324
Diluted weighted-average common equivalent shares outstanding (in Shares)	35,160	37,826	36,634
Legal Fees Member
Operating expenses:
Legal Fees	3,379	5,418	9,457
Legal Fee Provision Reversal Member
Operating expenses:
Legal Fees			$ (6,356)