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Net Loss Per Share
 6 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Net Loss Per Share Net Loss Per Share
 
Basic net loss per share attributable to common stockholders is computed by dividing net loss attributable to common stockholders by the weighted-average number of shares of common stock outstanding during the period. Diluted net loss per share is computed by dividing net loss attributable to common stockholders by the weighted-average number of shares of common stock outstanding during the period, adjusted for the effects of dilutive shares of common stock, which are comprised of outstanding common stock options, RSUs, ESPP obligations, convertible senior notes and warrants. The dilutive potential shares of common stock are computed using the treasury stock method or the as-if converted method, as applicable. The effects of outstanding common stock options, RSUs, ESPP obligations, convertible senior notes and warrants are excluded from the computation of diluted net loss per share in periods in which the effect would be antidilutive.

The following table presents the calculation of basic and diluted net loss per share (in thousands, except share and per share data): 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2017
 
2016
 
2017
 
2016
Numerator:
 
 
 
 
 
 
 
Net loss
$
(56,473
)
 
$
(49,625
)
 
$
(97,135
)
 
$
(382,957
)
Denominator:
 
 
 
 
 
 
 
Weighted-average shares outstanding—basic and diluted
170,419,083

 
163,838,755

 
169,585,356

 
162,952,721

Net loss per share—basic and diluted:
$
(0.33
)
 
$
(0.30
)
 
$
(0.57
)
 
$
(2.35
)

 
Potentially dilutive securities that are not included in the calculation of diluted net loss per share because doing so would be antidilutive are as follows:
 
June 30,
 
2017
 
2016
Common stock options
4,992,394

 
6,902,902

Restricted stock units
13,270,087

 
13,274,438

ESPP obligations
286,176

 
288,467

2018 convertible senior notes
7,783,023

 
7,783,023

Warrants related to the issuance of 2018 convertible senior notes
7,783,023

 
7,783,023

2022 convertible senior notes
5,806,936

 
—

Warrants related to the issuance of 2022 convertible senior notes
5,806,936

 
—

Total potentially dilutive securities
45,728,575

 
36,031,853