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Net Loss Per Share (Tables)
 9 Months Ended
Sep. 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 nine-month periods ended September 30, 2019 and September 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
September 30,
  
Nine Months Ended
September 30,
 
  
2019
  
2018
  
2019
  
2018
 
Numerator:
            
Net loss
 
$
(18,412
)
 
$
(15,038
)
 
$
(53,610
)
 
$
(47,432
)
Denominator:
                
Weighted-average number of common shares – basic
  
25,031,478
   
23,646,192
   
24,992,229
   
19,335,541
 
Loss per common share - basic
 
$
(0.74
)
 
$
(0.64
)
 
$
(2.15
)
 
$
(2.45
)