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Quarterly Financial Information (unaudited) (Tables)
 12 Months Ended
Dec. 31, 2019
Quarterly Financial Information (unaudited) [Abstract]  
Quarterly Financial Information
 
 
First
  
Second
  
Third
  
Fourth
 
 
    
(in thousands except per share)
    
2019
            
Revenue
 
$
8
  
$
38
  
$
4
  
$
35
 
Loss from operations
 
$
(5,634
)
 
$
(4,552
)
 
$
(4,976
)
 
$
(4,503
)
Net loss
 
$
(5,608
)
 
$
(4,130
)
 
$
(4,956
)
 
$
(4,485
)
Basic and diluted (loss) per common share
 
$
(.08
)
 
$
(.06
)
 
$
(.07
)
 
$
(.07
)

 
 
First
  
Second
  
Third
  
Fourth
 
 
    
(in thousands except per share)
    
2018
            
Revenue
 
$
6
  
$
16
  
$
7
  
$
34
 
Loss from operations
 
$
(7,608
)
 
$
(6,462
)
 
$
(4,948
)
 
$
(6,439
)
Net loss
 
$
(7,605
)
 
$
(6,450
)
 
$
(4,934
)
 
$
(6,417
)
Basic and diluted (loss) per common share
 
$
(0.13
)
 
$
(0.10
)
 
$
(0.08
)
 
$
(0.09
)