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Net Loss Per Share | 12 Months Ended
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Dec. 31, 2020
Net Loss Per Share |
Net Loss Per Share | Note 3—Net Loss Per Share Our potentially dilutive securities include potential common shares related to our stock options, warrant and unsecured convertible senior notes. Diluted earnings per share (Diluted EPS) considers the impact of potentially dilutive securities except in periods in which there is a loss because the inclusion of the potential common shares would have an anti-dilutive effect. Diluted EPS excludes the impact of potential common shares related to our stock options in periods in which the option exercise price is greater than the average market price of our common stock for the period. Potentially dilutive securities excluded from Diluted EPS are as follows: ​
​ | ​ | ​ | ​ | ​ | ​
​ | Year Ended December 31,
​ | 2020 |  | 2019 |  | 2018
Outstanding options to purchase common stock | 1,585,332 | ​ | 2,664,841 | ​ | 2,856,342
Outstanding warrants to purchase common stock | 10,792 | ​ | 16,153 | ​ | 16,851
Total potentially dilutive shares excluded from loss per share | 1,596,124 |  | 2,680,994 |  | 2,873,193
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