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Net Loss per Share | 12 Months Ended
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Dec. 31, 2015
Net Loss per Share |
Net Loss per Share | 10. Net Loss per Share Diluted loss per share is the same as basic loss per share for all periods presented because the effects of potentially dilutive items were anti-dilutive, given the Company's net loss. The following securities have been excluded from the calculation of weighted-average shares of common stock outstanding because the effect is anti-dilutive for the years ended December 31, 2015, 2014 and 2013:
|  | Year Ended December 31, |
|  | 2015 |  | 2014 |  | 2013 |
Redeemable convertible preferred stock: |  |  |  |  |  |  |  |  |  |
Series A |  |  | — |  |  | — |  |  | 10,033,976 |
Series B |  |  | — |  |  | — |  |  | 5,057,901 |
Series C |  |  | — |  |  | — |  |  | 4,429,601 |
Series D |  |  | — |  |  | — |  |  | 3,979,730 |
Warrants to purchase Series D redeemable convertible preferred stock |  |  | — |  |  | — |  |  | 83,818 |
Stock options |  |  | 5,298,510 |  |  | 5,850,211 |  |  | 5,883,885 |
Restricted stock units |  |  | 1,220,008 |  |  | 992,665 |  |  | — |
Basic and diluted net loss per share attributable to holders of common stock is calculated as follows:
|  | Year Ended December 31, |
|  | 2015 |  | 2014 |  | 2013 |
Numerator (in thousands): |  |  |  |  |  |  |  |  |  |
Net loss attributable to holders of common stock |  | $ | (26,733 | ) | $ | (29,088 | ) | $ | (28,300 | )
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Denominator: |  |  |  |  |  |  |  |  |  |
Weighted-average shares of common stock outstanding, basic and diluted |  |  | 42,420,356 |  |  | 32,075,107 |  |  | 7,432,055 |
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Net loss per share attributable to holders of common stock, basic and diluted |  | $ | (0.63 | ) | $ | (0.91 | ) | $ | (3.81 | )
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