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Net Loss per Share (Tables)
 9 Months Ended
Sep. 30, 2015
Earnings Per Share [Abstract]  
Schedule of Computation of Net Loss per Common Share
The following table sets forth the computation of net loss per common share (in thousands, except per share amounts):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2015
 
2014
 
2015
 
2014
Numerator:
 
 
 
 
 
 
 
Net loss
$
(135,530
)
 
$
(120,031
)
 
$
(403,067
)
 
$
(338,064
)
Denominator:
 
 
 
 
 
 
 
Weighted average number of shares outstanding—basic and diluted
154,523
 
144,923

 
153,440
 
140,285

Net loss per share—basic and diluted
$
(0.88
)

$
(0.83
)

$
(2.63
)

$
(2.41
)
Schedule of Outstanding Options and Unvested Shares Excluded from Computation of Diluted Net Loss per Share
The following outstanding options and unvested shares were excluded (as common stock equivalents) from the computation of diluted net loss per common share for the periods presented as their effect would have been anti-dilutive (in thousands):
 
As of September 30,
 
2015
 
2014
Options to purchase common stock
12,182

 
21,324

Unvested early exercised common shares
1,236

 
2,676

Unvested restricted stock awards and units
13,403

 
8,041

Convertible senior notes
15,141

 
—

ESPP shares
343

 
406