Basic (loss) earnings per share is calculated by dividing net (loss) income attributable to common stockholders by the weighted-average number of common shares and, except for periods with a loss from operations, participating securities outstanding during the period. Diluted (loss) earnings per share reflects additional common shares that would have been outstanding if dilutive potential common shares had been issued. Potential common shares that be issued by the Company include convertible debt, convertible preferred stock, options and warrants.

 

The following table sets forth the reconciliation of the weighted average number of common shares outstanding used to compute basic and diluted earnings (loss) per share for the years ended and

 

		2018				2017
Weighted average shares outstanding, basic			170,535,343				161,592,569
Dilutive shares related to warrants			—				4,273,889
Unvested restricted stock			—				150,000
Weighted average shares outstanding, diluted			170,535,343				166,016,458

 

Diluted (loss) earnings per common share for the years ended and excludes the effects of million and million common share equivalents, respectively, since such inclusion would be anti-dilutive. The excluded shares consist of common shares issuable upon exercise of outstanding stock options and warrants, and upon the conversion of convertible debt and convertible preferred stock.

 

The Company’s unvested stock awards contain nonforfeitable rights to dividends or dividend equivalents, whether paid or unpaid (referred to as “participating securities”). Therefore, the unvested stock awards are required to be included in the number of shares outstanding for both basic and diluted earnings per share calculations. However, due to our loss from continuing operations, and shares of unvested restricted stock for the years ended and respectively, were excluded in determining basic and diluted loss per share because such inclusion would be anti-dilutive.