Series B Convertible Preferred Stock (Details 2) (Classification error for Series B-1 preferred stock carrying value, USD $)	9 Months Ended
	Sep. 30, 2013
Classification error for Series B-1 preferred stock carrying value
Correction of error
Amount of error corrected	$ 4,487,000
Correction of a classification error	The error resulted in an overstatement of the carrying value of the Series B-1 preferred stock in mezzanine and a corresponding overstatement of deficit accumulated during the development stage.