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Earnings per share (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Schedule of computation of basic and diluted net loss per share for common stockholders | The following table sets forth the computation of basic and diluted earnings per share for common stockholders:
|  | Year ended December 31, |
|  | 2017 |  | 2016 |  | 2015 |
Numerator |  |  |  |  |  |  |  |  |  |
Net loss |  | $ | (79,000 | ) |  | $ | (142,110 | ) |  | $ | (170,447 | ) |
Denominator |  |  |  |  |  |  |  |  |  |
Denominator for basic and diluted net loss per share |  | 39,183,073 |  |  | 34,044,584 |  |  | 33,626,248 |  |
Net loss per share: |  |  |  |  |  |  |  |  |  |
Basic and diluted |  | $ | (2.02 | ) | * | $ | (4.17 | ) | * | $ | (5.07 | ) | *
* For the years ended December 31, 2017, 2016, and 2015, the Company experienced a net loss and therefore did not report any dilutive share impact.
Schedule of historical dilutive common share equivalents outstanding | 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 December 31,
|  | 2017 |  | 2016 |  | 2015
Stock Options |  | 6,448,642 |  |  | 5,854,316 |  |  | 4,826,477 |
Unvested restricted stock |  | 393,011 |  |  | 271,651 |  |  | 344,335 |
Total |  | 6,841,653 |  |  | 6,125,967 |  |  | 5,170,812 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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