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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2014
Summary of Significant Accounting Policies [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 years ended December 31, 2014, 2013, and 2012 are as follows:

(in thousands, except share data)
 
2014
  
2013
  
2012
 
Net loss – basic
 
$
(17,381
)
 
$
(30,324
)
 
$
(51,868
)
Adjust for gain on warrant derivative liability
  
—
   
(1,835
)
  
—
 
Net loss - diluted
  
(17,381
)
  
(32,159
)
  
(51,868
)
Net loss per share – basic
  
(1.84
)
  
(4.81
)
  
(13.54
)
Weighted average shares outstanding – basic
  
9,452,050
   
6,300,614
   
3,829,721
 
Potentially dilutive warrant exercises
  
—
   
268,397
   
—
 
Weighted average shares outstanding – diluted
  
9,452,050
   
6,569,011
   
3,829,721
 
Net loss per share – diluted
  
(1.84
)
  
(5.10
)
  
(13.54
)
Shares excluded from the computation of diluted EPS
Shares excluded from the computation of diluted EPS:
 
 
 
2014
 
 
2013
 
 
2012
 
Stock options
 
 
281,735
 
 
 
252,158
 
 
 
299,242
 
Unvested restricted shares
 
 
29,799
 
 
 
20,347
 
 
 
31,267
 
Warrants
 
 
850,138
 
 
 
589,500
 
 
 
352,664
 
Total
 
 
1,161,672
 
 
 
862,005
 
 
 
683,173