CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Interest Rate, Convertible Senior Notes due 2015 (as a percent)	5.50%	5.50%
5.5% Convertible Senior Notes due 2015, unamortized discount (in dollars)	$ 16,091,162	$ 18,530,539
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized	600,000,000	600,000,000
Common stock, shares issued	169,823,681	169,823,681
Common stock, shares outstanding	169,749,981	169,749,981
Treasury stock, common shares	73,700	73,700
Series B Convertible Preferred stock
Convertible Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Convertible Preferred stock, shares authorized	20,000	20,000
Convertible Preferred stock, shares outstanding	0	0
Series C Convertible Preferred stock
Convertible Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Convertible Preferred stock, shares authorized	2,000,000	2,000,000
Convertible Preferred stock, shares outstanding	182,065	182,065