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Net Loss Per Share
 6 Months Ended
Jun. 30, 2015
Earnings Per Share [Abstract]  
Net Loss Per Share

Note 8 — Net Loss Per Share

Basic net loss per share is calculated based on the weighted-average number of common shares outstanding during the periods presented. For all periods presented in the accompanying Condensed Consolidated Statements of Operations, the net loss available to common stockholders is equal to the reported net loss. Basic and diluted net loss per share are the same due to our historical net losses and the requirement to exclude potentially dilutive securities which would have an anti-dilutive effect on net loss per share. During the three and six month periods ended June 30, 2015 and 2014, potentially dilutive securities consisted of common shares underlying outstanding stock options. During the three months ended June 30, 2015 and 2014, there were weighted average outstanding stock options of 21.6 million and 22.5 million, respectively, and during the six months ended June 30, 2015 and 2014, there were weighted average outstanding stock options of 21.7 million and 21.9 million, respectively.