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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2015
Fair Value Measurements [Abstract]  
Assets measured at fair value on recurring basis
The following is a summary of valuation techniques utilized by the Company for its significant financial and non-financial assets and liabilities as of March 31, 2015 and December 31, 2014:
 
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 (in thousands).

  
Quoted Prices in Active Markets for Identical Assets
 (Level 1)
  
Significant Other Observable Inputs
 (Level 2)
  
Significant Unobservable Inputs
 (Level 3)
  
Total
March 31, 2015
 
Equity securities                                                      
 
$
73
  
$
—
  
$
—
  
$
73
 
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