Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Summary of Significant Accounting Policies

Schedule of 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

	Year Ended December 31,
	2017		2016		2015
Stock options		10,856,212		10,218,710		8,110,239
Restricted stock		96,668		50,000		19,500
		10,952,880		10,268,710		8,129,739