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Net Income (Loss) Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
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,
 
2018
 
2017
 
2016
Numerator:
 
 
 
 
 
  Net loss
$
(21,035
)
 
$
(82,955
)
 
$
(72,314
)
Denominator:
 
 
 
 
 
Weighted average number of shares outstanding:
 
 
 
 
 
  Basic and diluted
85,615

 
80,974

 
77,705

Net loss per share:
 
 
 
 
 
  Basic and diluted
$
(0.25
)
 
$
(1.02
)
 
$
(0.93
)
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share
The following table sets forth 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,
 
2018
 
2017
 
2016
Stock options
3,327

 
4,470

 
5,295

Restricted stock units
2,997

 
3,059

 
2,536

Stock purchase rights under the ESPP
609

 
620

 
659

Warrants (1)
1,268

 
782

 
206

  Total (2)
8,201

 
8,931

 
8,696