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Net Loss Per Share (Tables) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2014 | Dec. 31, 2013
Earnings Per Share [Abstract] |  |
Computation of Basic and Diluted Earnings Per Share |  | Basic and diluted net loss per share attributable to common stockholders was calculated as follows for the years ended December 31, 2011, 2012 and 2013:
|  | Year Ended December 31, |
|  | 2011 |  |  | 2012 |  |  | 2013 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  | $ | (13,157 | ) |  | $ | (13,880 | ) |  | $ | (14,027 | )
Accretion of redeemable convertible preferred stock to redemption value |  |  | (53 | ) |  |  | (67 | ) |  |  | (213 | )
Net loss attributable to common stockholders |  | $ | (13,210 | ) |  | $ | (13,947 | ) |  | $ | (14,240 | )
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding, basic and diluted |  |  | 688,946 |  |  |  | 709,678 |  |  |  | 729,001 |
Net loss per share attributable to common stockholders, basic and diluted |  | $ | (19.17 | ) |  | $ | (19.65 | ) |  | $ | (19.53 | )
Summary of Common Stock Equivalents Outstanding | The following common stock equivalents, outstanding as of September 30, 2014 and 2013, were excluded from the computation of diluted net loss per share for the nine months ended September 30, 2014 and 2013 because they had an anti-dilutive impact:
|  | As of September 30, |
|  | 2014 |  |  | 2013 |
Options to purchase common stock |  |  | 1,839,895 |  |  |  | 1,283,264 |
Redeemable convertible preferred stock |  |  | — |  |  |  | 78,372,931 |
Total options and redeemable convertible preferred stock exercisable or convertible into common stock |  |  | 1,839,895 |  |  |  | 79,656,195 |
| The Company excluded the following common stock equivalents, outstanding as of December 31, 2011, 2012 and 2013, from the computation of diluted net loss per share attributable to common stockholders for the years ended December 31, 2011, 2012 and 2013 because they had an anti-dilutive impact due to the net loss attributable to common stockholders incurred for the periods.
|  | December 31, |
|  | 2011 |  |  | 2012 |  |  | 2013 |
Stock options to purchase common stock |  |  | 916,094 |  |  |  | 591,427 |  |  |  | 1,310,330 |
Unvested restricted common stock |  |  | 24,548 |  |  |  | 10,615 |  |  |  | — |
|  |  | 940,642 |  |  |  | 602,042 |  |  |  | 1,310,330 |

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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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