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Net loss per share (Tables)
 6 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Schedule of computation of basic and diluted net loss available to common stockholders
The following tables set forth the computation of basic and diluted net loss per share:
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2017
 
2016
 
2017
 
2016
 
Numerator
 

 
 

 
 

 
 

 
Net loss
$
(17,475
)
 
$
(38,914
)
 
$
(46,532
)
 
$
(80,147
)
 
Denominator
 

 
 

 
 

 
 

 
Denominator for basic and diluted net loss per share
39,621,738

 
34,000,333

 
36,978,528

 
33,959,751

 
Net loss per share:
 

 
 

 
 

 
 

 
Basic and diluted
$
(0.44
)
*
$
(1.14
)
*
$
(1.26
)
*
$
(2.36
)
*
 
 
*In the three and six months ended June 30, 2017 and 2016, 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 June 30,
 
2017
 
2016
Stock Options
7,124,052

 
5,969,382

Unvested restricted stock awards and units
423,986

 
274,490

Total
7,548,038

 
6,243,872