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Summary of Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 2017
Accounting Policies [Abstract]  
Reconciliation of the Weighted Average Number of Shares Used to Compute Basic and Diluted Net Loss per Share
The following table sets forth the reconciliation of the weighted average number of common shares used to compute basic and diluted net loss per share for the three and nine months ended September 30, 2017 and 2016:
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2017
 
2016
 
2017
 
2016
 
(in thousands, except per share amounts)
Numerator:
 

 
 

 
 

 
 

Net loss
$
(45,179
)
 
$
(37,760
)
 
$
(127,265
)
 
$
(107,871
)
Denominator:
 

 
 

 
 

 
 

Weighted average common shares used in calculation of basic net loss per share:
65,312

 
61,878

 
63,199

 
61,871

Effect of dilutive securities:
 

 
 

 
 

 
 

Common stock options
—

 
—

 
—

 
—

RSUs
—

 
—

 
—

 
—

Weighted average common shares outstanding used in calculation of diluted net loss per share
65,312

 
61,878

 
63,199

 
61,871

Net loss per share:
 

 
 

 
 

 
 

Basic and Diluted
$
(0.69
)
 
$
(0.61
)
 
$
(2.01
)
 
$
(1.74
)
Potentially Dilutive Securities Excluded from Computations of Diluted Weighted Average Common Shares Outstanding
The following potentially dilutive securities have been excluded from the computations of diluted weighted average common shares outstanding as of September 30, 2017 and 2016 as their effect would have been anti-dilutive (in thousands):
 
 
2017
 
2016
Stock options to purchase common stock
8,601

 
7,306

Unvested RSUs
47

 
89