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Quarterly Financial Data (unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Data (unaudited) [Abstract]  
Quarterly Financial Information
Summarized quarterly financial data for 2017 and 2016 is as follows (in thousands, except per share data):
  
Quarters Ended
 
  
March 31
  
June 30
  
September 30
  
December 31
 
  
(In thousands, except per share data)
 
2017
            
Total revenues
 
$
—
  
$
—
  
$
—
  
$
100
 
Net loss
 
$
(11,044
)
 
$
(14,358
)
 
$
(5,124
)
 
$
(4,460
)
Basic and diluted loss per share applicable to common stock
 
$
(0.60
)
 
$
(0.60
)
 
$
(1.14
)
 
$
(0.16
)
                 
2016
                
Total revenues
 
$
—
  
$
100
  
$
—
  
$
100
 
Net loss
 
$
(12,643
)
 
$
(18,280
)
 
$
(12,175
)
 
$
(7,672
)
Basic and diluted loss per share applicable to common stock
 
$
(1.14
)
 
$
(1.62
)
 
$
(0.78
)
 
$
(0.48
)