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Net Loss Per Share | 6 Months Ended
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Jun. 30, 2019
Earnings Per Share [Abstract] |
Net Loss Per Share | 9. 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 and pre-funded warrants outstanding during the period. The pre-funded warrants are included in the computation of basic net loss per share as the exercise price is negligible and they are fully vested and exercisable. 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 |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Unvested restricted common stock |  |  | 6,861 |  |  |  | 30,408 |  |  |  | 6,861 |  |  |  | 31,233 |
Options to purchase common stock |  |  | 4,081,102 |  |  |  | 3,015,991 |  |  |  | 3,781,559 |  |  |  | 2,856,763 |

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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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