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Earnings Per Share
 3 Months Ended
Mar. 31, 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 months ended March 31, 2013 or March 31, 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 months ended March 31, 2013 and 2014 (in thousands, except per share data):
 
Three Months Ended
 
March 31,
 
2013

2014
Loss from continuing operations
$
(560
)
 
$
(412
)
Basic weighted-average common shares outstanding
58,001

 
59,678

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

 
—

Diluted weighted-average common shares outstanding
58,001

 
59,678

Loss from continuing operations:
 
 
 
Basic loss per share
$
(0.01
)
 
$
(0.01
)
Diluted loss per share
$
(0.01
)
 
$
(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

March 31,
 
2013

2014
 
Number of
Potential
Shares

Range of
Exercise Prices

Number of
Potential
Shares

Range of
Exercise Prices
Stock options
9,159,312


$0.47 - $16.36


10,923,538


$0.47 - $7.84

Unvested stock awards
508,221


$
—


43,220


—

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
 
March 31, 2013
 
March 31, 2014
Shares issued:
 
 
 
Options exercised
4

 
632

Shares purchased under stock plan
458

 
198

Share decreases:
 
 
 
Shares repurchased for tax purposes
(87
)
 
(15
)
Restricted stock awards canceled
(23
)
 
—