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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2015
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.

  
Quoted Prices in Active Markets for Identical Assets
 (Level 1)
  
Significant Other Observable Inputs
 (Level 2)
  
Significant Unobservable Inputs
 (Level 3)
  
Total
December 31, 2015
 
Equity securities                                                      
 
$
56
  
$
—
  
$
—
  
$
56
 
U.S. Treasury securities (cash equivalents)
 
$
4,089
  
$
—
  
$
—
  
$
4,089
 

  
Quoted Prices in Active Markets for Identical Assets
 (Level 1)
  
Significant Other Observable Inputs
 (Level 2)
  
Significant Unobservable Inputs
 (Level 3)
  
Total
December 31, 2014
 
Equity securities                                                      
 
$
60
  
$
—
  
$
—
  
$
60
 
U.S. Treasury securities (cash equivalents)
 
$
4,089
  
$
—
  
$
—
  
$
4,089