Common Stock (Details) (Warrant [Member], USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Warrant [Member]
Derivative [Line Items]
Outstanding (in shares)	31,545,948	7,834,896
Granted (in shares)	2,884,470	23,711,052
Exercised (in shares)	(19,035,638)
Forfeited (in shares)	(10,719,366)
Outstanding (in shares)	4,675,414	31,545,948	7,834,896
Weighted average exercise price outstanding (in dollars per share)	$ 0.25	$ 1.40
Weighted average exercise price, granted (in dollars per share)	$ 1.02	$ 0.02
Weighted average exercise price, exercised (in dollars per share)	$ 0.00
Weighted average exercise price, forfeited (in dollars per share)	$ 1.02
Weighted average exercise price outstanding (in dollars per share)	$ 0.01	$ 0.25	$ 1.40
Weighted average remaining contractual life	2 years	2 years 9 months 15 days	3 years 2 months 1 day