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Net Income (Loss) Per Share (Tables)
 12 Months Ended
Dec. 31, 2019
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,
 
2019
 
2018
 
2017
Numerator:
 
 
 
 
 
  Net loss
$
(5,924
)
 
$
(21,035
)
 
$
(82,955
)
Denominator:
 
 
 
 
 
Weighted average number of shares outstanding:
 
 
 
 
 
  Basic and diluted
89,575

 
85,615

 
80,974

Net loss per share:
 
 
 
 
 
  Basic and diluted
$
(0.07
)
 
$
(0.25
)
 
$
(1.02
)
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,
 
2019
 
2018
 
2017
Convertible notes
1,322

 
—

 
—

Stock options
2,568

 
3,327

 
4,470

Restricted stock units
2,955

 
2,997

 
3,059

Stock purchase rights under the ESPP
478

 
609

 
620

Warrants (1)
4,321

 
1,268

 
782

  Total
11,644

 
8,201

 
8,931