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Net Loss Per Share Available to Common Stockholders (Tables)
 6 Months Ended
Jun. 30, 2019
Net Loss Per Share Available to Common Stockholders [Abstract]  
Calculation of Basic and Diluted Net Loss Per Share
The following table presents the calculation of basic and diluted net loss per share for the periods presented:

  
Three Months Ended June 30,
  
Six Months Ended June 30,
 
  
2019
  
2018
  
2019
  
2018
 
Numerator:
            
Net loss available to common stockholders
 
$
(4,003
)
 
$
(8,276
)
 
$
(8,609
)
 
$
(17,388
)
Denominator:
                
Weighted average number of shares, basic and diluted
  
6,201
   
5,767
   
6,074
   
5,751
 
Net loss per share available to common stockholders
                
Basic and diluted net loss per common share available to common stockholders
 
$
(0.65
)
 
$
(1.44
)
 
$
(1.42
)
 
$
(3.02
)
Common Stock Outstanding, Excluded from Computation of Diluted Net Loss Per Share
The following table presents the potential shares of common stock outstanding that were excluded from the computation of diluted net loss per share available to common stockholders for the periods presented because including them would have been anti-dilutive:

  
Three and Six Months Ended June 30, June 30,
  
2019
 
2018
Options to purchase common stock
 
                        553
 
                        548
Unvested RSUs
 
                     1,152
 
                        938
Total
 
                     1,705
 
                     1,486