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Net Loss Per Common Share (Tables) | 9 Months Ended
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Sep. 30, 2017
Earnings Per Share [Abstract] |
Schedule of outstanding shares of common stock equivalents that have been excluded from diluted net loss per common share | The following outstanding common stock equivalents have been excluded from diluted net loss per common share because their inclusion would be anti-dilutive:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Shares of common stock subject to outstanding options | 6,322,215 |  |  | 5,312,081 |  |  | 6,134,966 |  |  | 5,031,926 |
Employee stock purchase plan | 25,481 |  |  | 29,435 |  |  | 31,944 |  |  | 34,262 |
Restricted stock units | 70,000 |  |  | — |  |  | 59,945 |  |  | — |
Total common stock equivalents | 6,417,696 |  |  | 5,341,516 |  |  | 6,226,855 |  |  | 5,066,188 |

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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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