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Earnings Per Share
 6 Months Ended
Jun. 30, 2014
Earnings Per Share [Abstract]  
Earnings Per Share
Earnings Per Share

Basic earnings per share, including continuing and discontinued operations, is calculated by dividing net income (loss) for the period by the weighted average number of common shares outstanding during the period. Diluted earnings per share, including continuing and discontinued operations, is computed by dividing net income (loss) for the period by the weighted average number of shares of common stock outstanding during the period and including the dilutive effect of common stock that would be issued assuming conversion or exercise of outstanding warrants, stock options, share based compensation awards and other dilutive securities. No such items were included in the computation of diluted loss per share in the three and six months ended June 30, 2014 because we incurred net losses in the periods and the effect of inclusion would have been anti-dilutive.

The following is a reconciliation of weighted-average shares outstanding used in the calculation of basic and diluted earnings from continuing operations per share for the three and six months ended June 30, 2013 and 2014 (in thousands, except per share data):
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2013

2014
 
2013
 
2014
Income (loss) from continuing operations
$
2,089

 
$
(78
)
 
$
1,529

 
$
(490
)
Basic weighted-average common shares outstanding
58,384

 
60,159

 
58,194

 
59,920

Assumed exercise of dilutive stock options, warrants and restricted stock
413

 
—

 
422

 
—

Diluted weighted-average common shares outstanding
58,797

 
60,159

 
58,616

 
59,920

Income (loss) per share from continuing operations:
 
 
 
 
 
 
 
Basic income (loss) per share
$
0.04

 
$
(0.00
)
 
$
0.03

 
$
(0.01
)
Diluted income (loss) per share
$
0.04

 
$
(0.00
)
 
$
0.03

 
$
(0.01
)


Outstanding equity awards not included in the calculation of diluted net loss per share because their effect was anti-dilutive were as follows:

Three Months Ended

June 30,
 
2013

2014
 
Number of
Potential
Shares

Range of
Exercise Prices

Number of
Potential
Shares

Range of
Exercise Prices
Stock options
7,299,887


$1.26 - $16.36


10,573,585


$0.47 - $7.84

Unvested stock awards
5,550


$
—


34,845


$
—

Warrants
1,602,489


$
2.40


1,602,489


$
2.40



 
Six Months Ended
 
June 30,
 
2013
 
2014
 
Number of
Potential
Shares
 
Range of
Exercise Prices
 
Number of
Potential
Shares
 
Range of
Exercise Prices
Stock options
8,725,951

 
$1.06 - $16.36

 
10,573,585

 
$0.47 - $7.84

Unvested stock awards
11,753

 
$
—

 
34,845

 
—

Warrants
1,602,489

 
$
2.40

 
1,602,489

 
2.40


Shares issued

Common stock activity during the period is as follows (in thousands).
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2013
 
2014
 
2013
 
2014
Shares issued:
 
 
 
 
 
 
 
Options exercised
27

 
273

 
31

 
905

Restricted stock awards granted
30

 
30

 
30

 
30

Shares purchased under stock plan
—

 
68

 
458

 
266

Share decreases:
 
 
 
 
 
 
 
Shares repurchased for tax purposes
(61
)
 
(2
)
 
(147
)
 
(17
)
Restricted stock awards canceled
—

 
—

 
(23
)
 
—