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Net Loss Per Share (Tables)
 12 Months Ended
Dec. 31, 2015
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, 2015, 2014, and 2013:

Year Ended December 31,

2015

2014

2013
Net loss
$
(50,424
)

(32,418
)

(16,068
)
Shares used in computing basic and diluted net loss per share
67,671


65,225


$
62,607

Basic and diluted net loss per share
$
(0.75
)

$
(0.50
)

(0.26
)
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,

2015

2014

2013
Conversion of the Senior Notes
14,767

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, 2015, 2014, and 2013:

 Year Ended December 31,

2015

2014

2013
Common stock options
1,651

1,822

2,374
Restricted stock awards
133

321

403
Restricted stock units
230

182

234
  Total
2,014

2,325

3,011