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Net Loss Per Share (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Schedule of Weighted Average Number of Shares Outstanding
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, 2017, 2016, and 2015:

Year Ended December 31,

2017

2016

2015
Net loss
$
(66,400
)

$
(154,677
)

$
(50,424
)
Shares used in computing basic and diluted net loss per share
83,325


80,976


67,671

Basic and diluted net loss per share
$
(0.80
)

$
(1.91
)

$
(0.75
)
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,

2017

2016

2015
Conversion of the Senior Notes
11,939

14,767

14,767
Deerfield Warrants
6,470

—

—
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, 2017, 2016, and 2015:

 Year Ended December 31,

2017

2016

2015
Common stock options
520

1,248

1,651
Restricted stock awards
119

129

133
Restricted stock units
250

370

230
  Total
889

1,747

2,014