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Net Loss Per Share | 9 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Net Loss Per Share | 8. Net Loss Per Share Basic and diluted net loss per share is computed by dividing net loss by the weighted-average number of common stock outstanding during the period. For periods in which the Company generated a net loss, the Company does not include the potential impact of dilutive securities in diluted net loss per share, as the impact of these items is anti-dilutive. The following weighted-average equity instruments were excluded from the calculation of diluted net loss per share because their effect would have been anti-dilutive for the periods presented:
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Unvested restricted common stock |  |  | 29,317 |  |  |  | 52,882 |  |  |  | 30,587 |  |  |  | 63,364 |
Options to purchase common stock |  |  | 3,075,526 |  |  |  | 2,294,012 |  |  |  | 2,930,485 |  |  |  | 1,846,593 |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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