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Net Loss per Common Share (Tables)
 6 Months Ended
Jun. 30, 2014
Net Loss per Common Share [Abstract]  
Calculation of net loss and number of shares used to compute basic and diluted earnings per share
The calculation of net loss and the number of shares used to compute basic and diluted earnings per share for the three and six month periods ended June 30, 2014 and 2013 are as follows:

 
 
Three months ended
June 30,
  
Six months ended
June 30,
 
(in thousands, except share data)
 
2014
  
2013
  
2014
  
2013
 
Net loss – basic
 
$
(4,600
)
 
$
(5,482
)
 
$
(9,878
)
 
$
(18,328
)
Adjustment for gain on warrant derivative liability
  
(356
)
  
—
   
(363
)
  
—
 
Net loss – diluted
 
$
(4,956
)
 
$
(5,482
)
 
$
(10,241
)
 
$
(18,328
)
 
                
Weighted average shares outstanding – basic
  
9,426,169
   
6,023,785
   
9,363,123
   
5,683,380
 
Adjustment for warrant exercises
  
54,764
   
—
   
99,594
   
—
 
Weighted average shares outstanding – diluted
  
9,480,933
   
6,023,785
   
9,462,717
   
5,683,380
 
 
                
Net loss per share – basic
 
$
(0.49
)
 
$
(0.91
)
 
$
(1.06
)
 
$
(3.22
)
Net loss per share – diluted
 
$
(0.52
)
 
$
(0.91
)
 
$
(1.08
)
 
$
(3.22
)
Anti-dilutive Securities Excluded from the Computation of Earnings per Share
The following potentially dilutive securities were excluded from the computation of earnings per share as of June 30, 2014 and 2013 because their effects would be anti-dilutive:

 
 
June 30,
 
 
 
2014
  
2013
 
Stock options
  
199,230
   
323,417
 
Unvested restricted shares
  
2,721
   
24,797
 
Warrants
  
589,500
   
339,994
 
Total
  
791,451
   
688,208