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Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2017
Summary of Significant Accounting Policies [Abstract]  
Computations of Basic and Diluted Net Loss Per Share
The computations of basic and diluted net loss per common share for the years ended December 31, 2017, 2016 and 2015 are as follows (in thousands, except per share amounts):

  
Year Ended December 31,
 
  
2017
  
2016
  
2015
 
Net loss
 
$
(19,375
)
 
$
(11,168
)
 
$
(8,735
)
Weighted average common shares outstanding – basic and diluted
  
30,195
   
26,529
   
21,009
 
Net loss per common share – basic and diluted
 
$
(0.64
)
 
$
(0.42
)
 
$
(0.42
)
Common Stock Equivalents Excluded from Computation of Diluted Net Loss Per Share of Common Stock
The following common stock equivalents were excluded from the computation of diluted net loss per common share of common stock for the years ended December 31, 2017, 2016 and 2015 because including them would have been antidilutive (in thousands):

 
Year Ended December 31,
 
 
2017
 
2016
 
2015
 
Stock options
  
3,390
   
3,017
   
2,240
 
Warrants
  
2,779
   
3,246
   
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