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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Basic and Diluted Loss Per Share Calculations
The table below sets forth the basic and diluted loss per share calculations:

  
Year Ended December 31,
 
  
2018
  
2017
  
2016
 
Net loss
 
$
(25,406
)
  
(17,278
)
 
$
(28,569
)
Basic and diluted weighted average number of shares outstanding
  
62,986
   
58,354
   
55,985
 
Basic and diluted loss per share
 
$
(0.40
)
  
(0.30
)
 
$
(0.51
)