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Net Loss Per Share | 12 Months Ended
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Dec. 31, 2016
Earnings Per Share [Abstract] |
Net Loss Per Share | Net Loss Per Share The following outstanding common stock equivalents have been excluded from diluted net loss per common share for the years ended December 31, 2016, 2015 and 2014 because their inclusion would be anti-dilutive:
| Year Ended December 31,
| 2016 |  | 2015 |  | 2014
Shares of common stock subject to outstanding options | 5,093,454 |  |  | 4,086,640 |  |  | 3,035,614 |
Employee stock purchase plan | 36,651 |  |  | 15,561 |  |  | — |
Restricted stock units | 25,000 |  |  | — |  |  | — |
Total common stock equivalents | 5,155,105 |  |  | 4,102,201 |  |  | 3,035,614 |

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