Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Preferred stock, issued to Principal Stockholder's family, par value	$ 0.001	$ 0.001
Preferred stock, issued to Principal Stockholder's family, shares issued	0	5,250,000
Preferred stock, issued to Principal Stockholder's family, shares outstanding	0	5,250,000
Aggregate redemption/liquidation of preferred stock, value	$ 0	$ 577,500
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	50,000,000	50,000,000
Preferred stock, shares issued	0	3,614,923
Preferred stock, shares outstanding	0	3,614,923
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	733,249,698	707,507,982
Common stock, shares outstanding	733,249,698	707,507,982
Preferred Stock Issued To Public [Member]
Warrants to purchase shares of common stock	709,501	22,663,212
Preferred stock, shares outstanding		3,614,923