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Quarterly Financial Data (unaudited)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Data (unaudited) [Abstract]  
Quarterly Financial Data (unaudited)
16. Quarterly Financial Data (unaudited)
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
)

Quarterly and year-to-date loss per share amounts are computed independently of each other. Therefore, the sum of the per share amounts for the quarters may not agree to the per share amounts for the year.