Schedule of Share-based Compensation, Non-vested Stock Options, Activity (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Beginning of Period	7,751,180	6,735,600	5,949,700
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures	1,690,500	3,427,000	1,240,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$ 1.32	$ 2.88	$ 1.46
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, End of Period	9,225,880	7,751,180	6,735,600
Non-vested stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Beginning of Period	481,500	75,000	127,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Grant Date Fair Value, Beginning of Period	$ 1.37	$ 1.16	$ 1.33
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures	1,690,500	3,427,000	1,240,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$ 1.23	$ 2.05	$ 0.93
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting During Period, Number	(964,950)	(3,020,500)	(1,292,000)
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting During Period, Weighted Average Grant date Fair Value	$ 1.20	$ 2.13	$ 0.95
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, End of Period	1,207,050	481,500	75,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Grant Date Fair Value, End of Period	$ 1.24	$ 1.37	$ 1.16