CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Convertible preferred stock, par value	$ 0.01	$ 0.01
Convertible preferred stock, shares authorized	100,000,000	100,000,000
Convertible preferred stock, issued	828,472	828,472
Convertible preferred stock, outstanding	828,472	828,472
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	240,000,000	240,000,000
Common stock, issued	184,893,886	179,167,112
Common stock, outstanding	184,893,886	179,167,112