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Net Loss Per Share (Tables) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 | Dec. 31, 2016
Earnings Per Share [Abstract] |  |
Common Shares Excluded from Net Income (Loss) | 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 |
| 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 |
Schedule of Earnings Per Share, Basic and Diluted | 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 | )

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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