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Net Loss Per Share | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 | Dec. 31, 2016
Earnings Per Share [Abstract] |  |
Net Loss Per Share | 9. Net Loss Per Share Basic and diluted earnings per share are calculated as follows:
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) (in thousands) |  | $ | (8,404 | ) |  | $ | 5,389 |  |  | $ | (20,122 | ) |  | $ | (11,104 | )
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of common shares outstanding |  |  | 37,421,273 |  |  |  | 9,101,730 |  |  |  | 31,944,243 |  |  |  | 9,035,173 |
Effect of dilutive securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options |  |  | — |  |  |  | 33,864 |  |  |  | — |  |  |  | — |
Warrants |  |  | — |  |  |  | 138,273 |  |  |  | — |  |  |  | — |
Dilutive potential common shares |  |  | — |  |  |  | 172,137 |  |  |  | — |  |  |  | — |
Shares used in calculating diluted earnings per share |  |  | 37,421,273 |  |  |  | 9,273,867 |  |  |  | 31,944,243 |  |  |  | 9,035,173 |
Basic net income (loss) per share |  | $ | (0.22 | ) |  | $ | 0.59 |  |  | $ | (0.63 | ) |  | $ | (0.30 | )
Diluted net income (loss) per share |  | $ | (0.22 | ) |  | $ | 0.58 |  |  | $ | (0.63 | ) |  | $ | (0.30 | )
The following table sets forth the potentially dilutive common shares excluded from the calculation of net loss per common share because their inclusion would be anti-dilutive (in thousands):
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Warrants to purchase common stock |  |  | 19,557 |  |  |  | 1,076 |  |  |  | 19,557 |  |  |  | 1,871 |
Options to purchase common stock |  |  | 505 |  |  |  | 322 |  |  |  | 505 |  |  |  | 515 |
Total |  |  | 20,062 |  |  |  | 1,398 |  |  |  | 20,062 |  |  |  | 2,386 |
| 10. Net Loss Per Share The Company accounts for and discloses net loss per common share in accordance with FASB ASC Topic 260 “Earnings per Share.” Basic net loss per common share is computed by dividing net loss attributable to common stockholders by the weighted-average number of common shares outstanding. Diluted net loss per common share is computed by dividing net loss attributable to common stockholders by the weighted-average number of common shares that would have been outstanding during the period assuming the issuance of common shares for all potential dilutive common shares outstanding. Potential common shares consist of shares issuable upon the exercise of stock options and warrants. The following table sets forth the potentially dilutive common shares excluded from the calculation of net loss per common share because their inclusion would be anti-dilutive (in thousands):
|  | December 31, |
|  | 2016 |  |  | 2015 |
Warrants to purchase common stock |  |  | 2,570 |  |  |  | 1,115 |
Options to purchase common stock |  |  | 561 |  |  |  | 663 |
Total |  |  | 3,131 |  |  |  | 1,778 |

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