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Net Loss Per Share (Tables)
 6 Months Ended
Jun. 30, 2019
Net Loss Per Share [Abstract]  
Basic and Diluted Net Loss Per Share
As a result of the Company’s net losses incurred for the three and six-month periods ended June 30, 2019 and June 30, 2018, respectively, all potentially dilutive instruments outstanding would have anti-dilutive effects on per-share calculations for these periods.  Therefore, basic and diluted net loss per share were the same, as reflected below.

  
Three Months Ended
June 30,
  
Six Months Ended
June 30,
 
  
2019
  
2018
  
2019
  
2018
 
Numerator:
            
Net loss
 
$
(20,472
)
 
$
(36,493
)
 
$
(35,198
)
 
$
(32,394
)
Denominator:
                
Weighted-average number of common shares – basic
  
24,980,861
   
19,188,624
   
24,972,280
   
17,144,492
 
Loss per common share - basic
 
$
(0.82
)
 
$
(1.90
)
 
$
(1.41
)
 
$
(1.89
)