CONSOLIDATED BALANCE SHEETS Parenthetical (USD $)	Dec. 31, 2011	Dec. 31, 2010
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	300,000,000	300,000,000
Common stock, shares issued	8,816,737	6,658,903
Common stock, shares outstanding	8,816,737	6,658,903
Preferred stock
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	40,866,376	40,866,376
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Convertible preferred stock
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	9,133,624	9,133,624
Preferred stock, liquidation preference	$ 9.00	$ 9.00
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0