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Net Income (Loss) Per Share (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Numerators and Denominators of Basic and Diluted Net Income (Loss) Per Share Computations
The following table presents the calculation of basic and diluted net loss per share (in thousands, except per share amounts):
 
Year Ended December 31,
 
2017
 
2016
 
2015
Numerator:
 
 
 
 
 
  Net loss
$
(82,955
)
 
$
(72,314
)
 
$
(15,661
)
Denominator:
 
 
 
 
 
Weighted average number of shares outstanding:
 
 
 
 
 
  Basic and diluted
80,974

 
77,705

 
87,514

Net loss per share:
 
 
 
 
 
  Basic and diluted
$
(1.02
)
 
$
(0.93
)
 
$
(0.18
)
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share
The following table presents the potential weighted common shares outstanding that were excluded from the computation of basic and diluted net loss per share calculations (in thousands):
 
December 31,
 
2017
 
2016
 
2015
Stock options
4,470

 
5,295

 
6,460

Restricted stock units
3,059

 
2,536

 
2,178

Stock purchase rights under the ESPP
620

 
659

 
518

Warrants (1)
782

 
206

 
—

  Total (2)
8,931

 
8,696

 
9,156