Earnings/(Loss) per Common Share

3 Months Ended

Mar. 31, 2018

Basic and diluted loss per common share are calculated using the two-class method by dividing the net loss attributable to common shareholders by the weighted-average number of common shares outstanding during each period. Holders of Series B Preferred Shares are entitled to cumulative dividends, which are added to the reported net loss whether or not declared or paid to determine the net loss attributable to common shareholders under the two-class method.

For the three months ended March 31, 2018 and 2017, potential common shares under the treasury stock method and the if-converted method were antidilutive because the Company reported a net loss. Consequently, the Company did not have any adjustments in these periods between basic and diluted loss per share related to stock options, restricted stock units, warrants and convertible preferred shares.

The table below presents the weighted-average number of antidilutive potential common shares that are not considered in the calculation of diluted loss per share:



	Three Months Ended
	March 31, 2018	March 31, 2017
Series B Convertible Preferred Stock	8,494,733	33,240,261
Common share warrants	1,642,409	3,145,575
Employee stock options	5,347,188	6,217,966
Restricted stock units	611,927	565,093
	16,096,257	43,168,895