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Quarterly Financial Data (Unaudited)
 12 Months Ended
Dec. 31, 2013
Quarterly Financial Data (Unaudited) [Abstract]  
Quarterly Financial Data (Unaudited)
(14)Quarterly Financial Data (Unaudited)
 
Set forth below is selected quarterly financial data for each of the quarters in the years ended December 31, 2013 and 2012.

 
 
2013 Quarters Ended
 
 (in thousands except per share amounts)
 
March 31
  
June 30
  
September 30
  
December 31
 
Operating loss
 
$
(10,202
)
  
(10,587
)
  
(6,702
)
  
(5,526
)
Change in fair value of warrant liability, net
  
(2,272
)
  
5,115
   
(497
)
  
410
 
Net loss
  
(12,845
)
  
(5,482
)
  
(7,206
)
  
(4,792
)
Basic and diluted loss per share
  
(0.15
)
  
(0.06
)
  
(0.07
)
  
(0.04
)

 
 
2012 Quarters Ended
 
 (in thousands except per share amounts)
 
March 31
  
June 30
  
September 30
  
December 31
 
Operating loss
 
$
(14,554
)
 
$
(15,316
)
 
$
(12,175
)
 
$
(11,825
)
Change in fair value of warrant liability, net
  
(338
)
  
917
   
446
   
1,134
 
Net loss
  
(14,889
)
  
(14,512
)
  
(11,813
)
  
(10,657
)
Basic and diluted loss per share
  
(0.31
)
  
(0.26
)
  
(0.18
)
  
(0.14
)