Subsequent Events (Details) (USD $)	12 Months Ended			1 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Feb. 29, 2012 Issuance of Equity [Member]	Jan. 12, 2012 ADAPTIX, Inc. [Member] Acquisition [Member] Number
Subsequent Event [Line Items]
Business acquisition, purchase price allocation, cash					$ 10,000,000
Business acquisition, cost of acquired entity, cash paid					160,000,000
Business acquisition, number of patents acquired					230
Patents acquired in number of countries					13
Gross proceeds from the issuance of common stock				225,000,000
Stock issued during period, shares, new issues	5,750,000			6,120,000
Common Stock, Value, Issued	$ 0.001	$ 0.001		$ 36.75
Proceeds from Issuance of Common Stock	$ 175,229,000	$ 0	$ 0	$ 219,112,000