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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2014
Fair Value Measurements [Abstract]  
Assets measured at fair value on recurring basis
Assets
To estimate the fair value of its equity and U.S. Treasury 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
September 30,
2014
 
Equity securities                                                      
 
$
56
  
$
—
  
$
—
  
$
56
 
U.S. Treasury securities (cash equivalents)
 
$
4,439
  
$
—
  
$
—
  
$
4,439
 


 
Quoted Prices in Active Markets for Identical Assets
 (Level 1)
  
Significant Other Observable Inputs
 (Level 2)
  
Significant Unobservable Inputs
 (Level 3)
  
Total
December 31, 2013
 
Equity securities                                                      
 
$
61
  
$
—
  
$
—
  
$
61
 
U.S. Treasury securities (cash equivalents)
 
$
5,589
  
$
—
  
$
—
  
$
5,589