Net Loss Per Share

3 Months Ended

Mar. 31, 2017

Net Loss Per Share

Net Loss Per Share

(3)  Net Loss Per Share

Basic net loss per common share is based upon the weighted-average number of common shares outstanding during the period, excluding restricted stock that has been issued but is not yet vested. Diluted net loss per common share is based upon the weighted-average number of common shares outstanding during the period plus additional weighted-average potentially dilutive common shares outstanding during the period when the effect is dilutive. The 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 are as follows:

	Three Months Ended March 31,
	2017	2016
Stock options	10,159,130	8,157,550
Restricted stock	50,000	9,750
	10,209,130	8,167,300