Stockholders' Equity (Details) - Status Of Unvested Share-based Payment Awards (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Status Of Unvested Share-based Payment Awards [Abstract]
Shares underlying awards unvested at December 31, 2012	3,834,606	4,711,899
Shares underlying awards unvested at December 31, 2012 (in Dollars per share)	$ 1.05	$ 1.03
Shares underlying options granted	1,645,534	2,800,000	730,000
Shares underlying options granted (in Dollars per share)	$ 0.63	$ 0.48	$ 0.89
Shares underlying restricted stock units granted	1,338,018	249,000	1,400,000
Shares underlying restricted stock units granted (in Dollars per share)	$ 2.06	$ 1.77	$ 2.82
Shares underlying options vested	(1,216,632)
Shares underlying options vested (in Dollars per share)	$ 0.51
Shares underlying restricted stock units issued	(751,371)
Shares underlying restricted stock units issued (in Dollars per share)	$ 2.90
Shares underlying unvested options cancelled	(117,029)
Shares underlying unvested options cancelled (in Dollars per share)	$ 0.79
Shares underlying unvested restricted stock units cancelled	(21,227)
Shares underlying unvested restricted stock units cancelled (in Dollars per share)	$ 3.25
Shares underlying awards unvested at December 31, 2013	4,711,899
Shares underlying awards unvested at December 31, 2013 (in Dollars per share)	$ 1.03