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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 | Net loss per share Basic earnings per share is computed by dividing net loss by the weighted-average number of common shares outstanding. Diluted earnings per share is computed by dividing net loss by the weighted-average number of common shares plus the effect of any dilutive potential common shares outstanding during the period. The following tables set forth the computation of basic and diluted net loss per share:
| Three Months Ended September 30, |  | Nine Months Ended September 30, |
| 2018 |  | 2017 |  | 2018 |  | 2017 |
Numerator |  |  |  |  |  |  |  |  |  |  |  |
Net loss | $ | (50,969 | ) |  | $ | (33,738 | ) |  | $ | (79,751 | ) |  | $ | (80,270 | ) |
Denominator |  |  |  |  |  |  |  |  |  |  |  |
Denominator for basic and diluted net loss per share | 48,096,521 |  |  | 41,296,740 |  |  | 45,310,690 |  |  | 38,433,749 |  |
Net loss per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic and diluted | $ | (1.06 | ) | * | $ | (0.82 | ) | * | $ | (1.76 | ) | * | $ | (2.09 | ) | *
*In the three and nine months ended September 30, 2018 and 2017, the Company experienced a net loss and therefore did not report any dilutive share impact. The following table shows historical dilutive common share equivalents outstanding, which are not included in the above historical calculation, as the effect of their inclusion is anti-dilutive during each period.
| As of September 30,
| 2018 |  | 2017
Stock Options | 9,545,522 |  |  | 6,612,765 |
Unvested restricted stock awards and units | 580,347 |  |  | 402,853 |
Total | 10,125,869 |  |  | 7,015,618 |

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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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