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Net Loss Per Share (Tables)
 6 Months Ended
Jun. 30, 2016
Earnings Per Share [Abstract]  
Summary of Computation of Basic and Diluted Net Loss Per Share
The following table sets forth the computation of our basic and diluted net loss per share (in thousands, except per share data):

 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2016
 
2015
 
2016
 
2015
Basic and diluted net loss per share
 
 
 
 
 
 
 
Numerator:
 
 
 
 
 
 
 
Net loss
$
(4,935
)
 
$
(9,977
)
 
$
(14,470
)
 
$
(23,711
)
Denominator:
 
 
 
 
 
 
 
Weighted-average shares outstanding - basic
64,861

 
61,945

 
64,584

 
61,690

Effect of dilutive potential common shares from stock options, stock awards and employee stock purchase plan
—

 
—

 
—

 
—

Weighted-average shares outstanding - diluted
64,861

 
61,945

 
64,584

 
61,690

Net loss per share:
 
 
 
 
 
 
 
     Basic and diluted
$
(0.08
)
 
$
(0.16
)
 
$
(0.22
)
 
$
(0.38
)
Summary of Outstanding Shares of Common Stock Equivalents
The following weighted-average outstanding shares of common stock equivalents were excluded from the computation of diluted net loss per share for the periods presented because including them would have been antidilutive (in thousands):

 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2016
 
2015
 
2016
 
2015
Stock options, stock awards and employee stock purchase plan
13,567

 
11,058

 
11,736

 
11,063

Common stock subject to repurchase
28

 
90

 
28

 
90

 
13,595

 
11,148

 
11,764

 
11,153