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Net Loss Per Share | 12 Months Ended
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Dec. 31, 2016
Earnings Per Share [Abstract] |
Net Loss Per Share | 14. Net Loss Per Share Basic and diluted net loss per share attributable to common stockholders was calculated as follows:
|  |  | Years ended December 31, |
|  |  | 2015 |  |  | 2016 |
Numerator: |  |  |
Basic and diluted net loss per common share |  |  |  | $ | (14,543) |  |  |  |  | $ | (11,991) |  |
Denominator: |  |  |
Weighted-average number of common shares used in loss per share – basic and diluted |  |  |  |  | 2,713,096 |  |  |  |  |  | 3,424,976 |  |
Loss per share – basic and diluted |  |  |  | $ | (5.36) |  |  |  |  | $ | (3.50) |  |
The Company’s potential dilutive securities, which include stock options and warrants to purchase common stock, have been excluded from the computation of diluted net loss per share as the effect would be to reduce the net loss per share. Therefore, the weighted average number of common shares outstanding used to calculate both basic and diluted net loss per share attributable to common stockholders is the same. The Company excluded the following potential common shares, presented based on amounts outstanding at each period end, from the computation of diluted net loss per share attributable to common stockholders for the periods indicated because including them would have had an anti-dilutive effect:
​ | ​ | ​ | Year ended December 31, | ​
​ | ​ | ​ | 2015 | ​ | ​ | 2016 | ​
Stock options | ​ | ​ | ​ | ​ | 206,298 | ​ | ​ | ​ | ​ | ​ | 389,378 | ​ | ​
Convertible preferred stock | ​ | ​ | ​ | ​ | 1,698 | ​ | ​ | ​ | ​ | ​ | 1,698 | ​ | ​
Common stock warrants | ​ | ​ | ​ | ​ | 45,343 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​
Total shares excluded from calculation | ​ | ​ | ​ | ​ | 253,340 | ​ | ​ | ​ | ​ | ​ | 391,076 | ​ | ​
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