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Net Loss Per Share Attributable to Common Stockholders (Tables) | 12 Months Ended
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Dec. 31, 2014
Earnings Per Share [Abstract] |
Schedule of Basic and Diluted Net Loss Per Common Share | The following table summarizes the computation of basic and diluted net loss per share attributable to common stockholders of the Company (in thousands, except share data and per share data):
|  | Years Ended December 31, |
|  | 2014 |  |  | 2013 |  |  | 2012 |
Net loss |  | $ | (23,342 | ) |  | $ | (17,143 | ) |  | $ | (22,101 | )
Accretion of preferred stock issuance costs to redemption value |  |  | — |  |  |  | — |  |  |  | (73 | )
Net loss attributable to common stockholders — basic and diluted |  | $ | (23,342 | ) |  | $ | (17,143 | ) |  | $ | (22,174 | )
Weighted-average number of common shares — basic and diluted |  |  | 14,548,516 |  |  |  | 684,330 |  |  |  | 609,344 |
Net loss per share attributable to common stockholders — basic and diluted |  | $ | (1.60 | ) |  | $ | (25.05 | ) |  | $ | (36.39 | )
Potentially Dilutive Securities Excluded from Computation of Diluted Weighted-Average Shares Outstanding | The following potentially dilutive securities outstanding have been excluded from the computation of diluted weighted-average shares outstanding, because such securities had an antidilutive impact due to the losses reported (in common stock equivalent shares):
|  | As of December 31, |
|  | 2014 |  |  | 2013 |  |  | 2012 |
Options to purchase common stock |  |  | 2,126,176 |  |  |  | 1,062,694 |  |  |  | 1,046,178 |
Warrants to purchase redeemable convertible preferred stock |  |  | — |  |  |  | 128,663 |  |  |  | 128,663 |
Warrants to purchase common stock |  |  | 128,663 |  |  |  | — |  |  |  | — |
Redeemable convertible preferred stock |  |  | — |  |  |  | 6,826,004 |  |  |  | 6,992,694 |
Convertible notes payable |  |  | — |  |  |  | 754,785 |  |  |  | — |

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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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