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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2016
Fair Value Measurements [Abstract]  
Assets measured at fair value on recurring basis

Assets

To estimate the market value of its marketable securities, the Company obtains current market pricing from quoted market sources or uses pricing for identical securities. Assets measured at fair value on a recurring basis are summarized below.

  

 Level 1
  

 Level 2
  

 Level 3
  
Total
December 31, 2016
 
Marketable Securities (equity securities) 
 
$
2,770
  
$
—
  
$
—
  
$
2,770
 
U.S. Treasury securities (cash equivalents)
 
$
1,002
  
$
—
  
$
—
  
$
1,002
 

  

 (Level 1)
  
(Level 2)
  

 (Level 3)
  
Total
December 31, 2015
 
Marketable Securities (equity securities) 
 
$
56
  
$
—
  
$
—
  
$
56
 
U.S. Treasury securities (cash equivalents)
 
$
4,089
  
$
—
  
$
—
  
$
4,089