Stock-based Compensation (Schedule of Information About Options and Warrants) (Details) (USD $)	6 Months Ended
	Jun. 30, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number Outstanding	43,291,969
Weighted Average Remaining Contractual Life (years)	3 years 9 months 11 days
Weighted Average Exercise Price	$ 0.48
Number Exercisable	43,105,469
Weighted Average Exercise Price	$ 0.48
$ 0.25-0.95 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum	$ 0.25
Range of Exercise Prices, maximum	$ 0.95
Number Outstanding	40,124,414
Weighted Average Remaining Contractual Life (years)	3 years 10 months 2 days
Weighted Average Exercise Price	$ 0.42
Number Exercisable	39,957,747
Weighted Average Exercise Price	$ 0.42
$ 1.00-1.59 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum	$ 1.00
Range of Exercise Prices, maximum	$ 1.59
Number Outstanding	2,823,055
Weighted Average Remaining Contractual Life (years)	3 years 1 month 13 days
Weighted Average Exercise Price	$ 1.04
Number Exercisable	2,803,222
Weighted Average Exercise Price	$ 1.04
$ 2.25-4.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, minimum	$ 2.25
Range of Exercise Prices, maximum	$ 4.00
Number Outstanding	344,500
Weighted Average Remaining Contractual Life (years)	2 years 6 months 7 days
Weighted Average Exercise Price	$ 2.54
Number Exercisable	344,500
Weighted Average Exercise Price	$ 2.54