Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2011	Dec. 31, 2010
Stockholders' equity:
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized shares (in shares)	500,000,000	500,000,000
Common stock, issued shares (in shares)	24,833,301	15,653,734
Common stock, outstanding shares (in shares)	24,833,301	15,653,734
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, authorized shares (in shares)	200,000,000	200,000,000
Preferred stock, issued shares (in shares)	0	9,174,589
Preferred stock, outstanding shares (in shares)	0	9,174,589