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Net Loss Per Share (Tables)
 12 Months Ended
Dec. 31, 2014
Earnings Per Share [Abstract]  
Schedule of Weighted Average Number of Shares
Net loss per share was computed by dividing net loss by the weighted average number of common shares outstanding for the years ended December 31, 2014, 2013, and 2012:

Year Ended December 31,

2014

2013

2012
Net loss
$
(32,418
)

$
(16,068
)

$
(35,774
)
Shares used in computing basic and diluted net loss per share
65,225


62,607


59,811

Basic and diluted net loss per share
$
(0.50
)

$
(0.26
)

$
(0.60
)
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share
The potential dilutive effect of these securities is shown in the chart below:

Year Ended December 31,

2014

2013

2012
Conversion of the Notes
3,588

3,588

—
The following outstanding Company securities, using the treasury stock method, were excluded from the above calculations of net loss per share because their impact would have been anti-dilutive due to the net losses during the years ended December 31, 2014, 2013, and 2012:

 Year Ended December 31,

2014

2013

2012
Common stock options
1,822

2,374

2,698
Restricted stock awards
321

403

405
Restricted stock units
182

234

492
  Total
2,325

3,011

3,595