Net Loss Per Share (Details) - shares	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Anti-dilutive securities
Potentially dilutive common shares that have not been included in the net loss per common share calculations because the effect would have been anti-dilutive	8,127,878	7,008,421
Stock options
Anti-dilutive securities
Potentially dilutive common shares that have not been included in the net loss per common share calculations because the effect would have been anti-dilutive	8,098,128	6,999,421
Restricted stock
Anti-dilutive securities
Potentially dilutive common shares that have not been included in the net loss per common share calculations because the effect would have been anti-dilutive	29,750	9,000