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Net loss per share - (Tables)
 6 Months Ended
Jun. 30, 2019
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,
 
 
2019
 
2018
 
2019
 
2018
 
Numerator
 

 
 

 
 

 
 

 
Net loss
$
(41,789
)
 
$
(9,520
)
 
$
(113,902
)
 
$
(28,782
)
 
Denominator
 

 
 

 
 

 
 

 
Denominator for basic and diluted net loss per share
55,912,748

 
46,137,833

 
57,113,141

 
46,257,397

 
Net loss per share:
 

 
 

 
 

 
 

 
Basic and diluted
$
(0.75
)
*
$
(0.21
)
*
$
(1.99
)
*
$
(0.62
)
*
 
*In the three and six months ended June 30, 2019 and 2018, 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,
 
2019
 
2018
Stock Options
10,853,301

 
8,166,403

Unvested restricted stock awards and units
665,002

 
584,181

Total
11,518,303

 
8,750,584