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Earnings per share (Tables)
 12 Months Ended
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