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Net Loss per Common Share (Tables) | 9 Months Ended | 12 Months Ended
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Sep. 30, 2015 | Dec. 31, 2014
NET LOSS PER COMMON SHARE |  |
Schedule of computations of basic and diluted net loss per share |
|  | Nine months ended September 30, |
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|  | 2014 |  | 2015 |
Net loss |  | $ | (14,448 | ) | $ | (17,730 | )
Extinguishment of preferred stock — see note 7 |  |  | — |  |  | 31,806 |
Accretion of prior preferred stock — see note 7 |  |  | (2,469 | ) |  | (23,327 | )
Accretion and dividends of Series D preferred stock |  |  | — |  |  | (1,245 | )
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Loss attributable to common shareholders — basic and diluted |  | $ | (16,917 | ) | $ | (10,496 | )
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Weighted-average number of common shares used in net loss per share — basic and diluted |  |  | 926,597 |  |  | 11,179,756 |
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Net loss per share — basic and diluted |  | $ | (18.26 | ) | $ | (0.94 | )
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|  | Years Ended December 31, |
--- | --- | --- | ---
|  | 2013 |  | 2014 |
Net loss |  | $ | (16,197 | ) | $ | (17,917 | )
Performance Adjustment of Series A |  |  | 12,239 |  |  | — |
Accruals of dividends and accretion to redemption value of preferred stock |  |  | (2,925 | ) |  | (3,300 | )
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Loss attributable to common shareholders — basic and diluted |  | $ | (6,883 | ) | $ | (21,217 | )
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Weighted-average shares used in computing basic and diluted net loss per common share |  |  | 1,697,044 |  |  | 933,997 |
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Basic and diluted net loss per common share |  | $ | (4.06 | ) | $ | (22.72 | )
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Schedule of potentially dilutive securities excluded from computations of diluted weighted-average shares outstanding |
|  | Nine months ended September 30, |
--- | --- | --- | ---
|  | 2014 |  | 2015 |
Outstanding stock options |  |  | 311,365 |  |  | 1,356,246 |
Warrants |  |  | 18,810 |  |  | 2,445 |
Redeemable convertible preferred stock |  |  | 6,552,820 |  |  | — |
Unvested restricted stock |  |  | 28,536 |  |  | 153,589 |
|  | Years Ended December 31, |
--- | --- | --- | ---
|  | 2013 |  | 2014 |
Stock Options |  |  | 229,791 |  |  | 281,029 |
Warrants |  |  | 4,170 |  |  | 18,809 |
Redeemable convertible preferred stock |  |  | 6,552,820 |  |  | 6,552,820 |
Unvested restricted stock |  |  | 55,298 |  |  | 15,387 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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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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