Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data	Jun. 30, 2011	Dec. 31, 2010
Common stock, par value	$ 0.01	$ 0.000008
Common stock, authorized shares	100,000,000	23,539,769
Common stock, outstanding shares	27,855,544	2,054,467
Series A Preferred Stock [Member]
Preferred stock, par value	$ 0.00001	$ 0.00001
Preferred stock, authorized shares	0	113,000,000
Preferred stock, outstanding shares	0	113,000,000
Preferred stock, liquidation preference	$ 0	$ 113,000
Series B Preferred Stock [Member]
Preferred stock, par value	$ 0.00001	$ 0.00001
Preferred stock, authorized shares	0	39,136,052
Preferred stock, outstanding shares	0	32,714,284
Preferred stock, liquidation preference	$ 0	$ 45,800