Stock-Based Compensation (Details) - Status Of Unvested Share-based Payment Awards (USD $)	6 Months Ended	9 Months Ended
	Dec. 31, 2012	Sep. 30, 2013	Sep. 30, 2012
Status Of Unvested Share-based Payment Awards [Abstract]
Shares underlying awards unvested at December 31, 2012		3,834,606
Shares underlying awards unvested at December 31, 2012 (in Dollars per share)		$ 1.05
Shares underlying options granted	1,625,534	1,625,534	2,800,000
Shares underlying options granted (in Dollars per share)		$ 0.63	$ 0.48
Shares underlying restricted stock units granted		338,018	243,000
Shares underlying restricted stock units granted (in Dollars per share)		$ 1.69
Shares underlying options vested		(1,045,485)
Shares underlying options vested (in Dollars per share)		$ 0.52
Shares underlying restricted stock units vested		(528,794)	(1,100,000)
Shares underlying restricted stock units vested (in Dollars per share)		$ 3.00
Shares underlying options cancelled	(111,420)	(111,420)
Shares underlying options cancelled (in Dollars per share)		$ 0.79
Shares underlying restricted stock units cancelled		(21,227)
Shares underlying restricted stock units cancelled (in Dollars per share)		$ 3.25
Shares underlying awards unvested at September 30, 2013	3,834,606	4,091,232
Shares underlying awards unvested at September 30, 2013 (in Dollars per share)	$ 1.05	$ 0.82