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Net Loss Per Share
6 Months Ended
Jun. 30, 2016
Earnings Per Share [Abstract]  
Net Loss Per Share
Net Income (Loss) Per Share

Basic and diluted earnings per share are calculated as follows:
 
 Three Months Ended June 30,
 
 Six Months Ended June 30,
 
2016
 
2015
 
2016
 
2015
Numerator:
 
 
 
 
 
 
 
Net income (loss) (in thousands)
$
5,389

 
$
(15,660
)
 
$
(11,104
)
 
$
(26,197
)
Denominator:
 
 
 
 
 
 
 
Weighted average number of common shares outstanding
182,034,593
 
161,383,398
 
180,703,456
 
148,647,581
Effect of dilutive securities
 
 
 
 
 
 
 
Stock options
677,279

 

 

 

Warrants
2,765,458

 

 

 

Dilutive potential common shares
3,442,737

 

 

 

Shares used in calculating diluted earnings per share
185,477,330

 
161,383,398

 
180,703,456

 
148,647,581

 
 
 
 
 
 
 
 
Basic net income (loss) per share
$
0.03

 
$
(0.10
)
 
$
(0.06
)
 
$
(0.18
)
Diluted net income (loss) per share
$
0.03

 
$
(0.10
)
 
$
(0.06
)
 
$
(0.18
)


The following table sets forth the potentially dilutive common shares excluded from the calculation of net income (loss) per common share because their inclusion would be anti-dilutive (in thousands):
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2016
 
2015
 
2016
 
2015
Warrants to purchase common stock
21,517

 
22,308

 
37,418

 
22,308

Options to purchase common stock
6,442

 
11,411

 
10,309

 
11,411

Total
27,959

 
33,719

 
47,727

 
33,719