Summary of Significant Accounting Policies (Details 5)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Summary of Significant Accounting Policies
Expected term	4 years	4 years
Expected volatility (as a percent)	83.15%	117.20%
Risk free rate (as a percent)	0.79%	0.61%
Expected dividends (as a percent)	0.00%	0.00%