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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2016
Fair Value Measurements [Abstract]  
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 (in thousands).

  
Level 1
  
Level 2
  
Level 3
  
Total
September 30, 2016
 
Equity securities 
 
$
55
  
$
—
  
$
—
  
$
55
 
U.S. Treasury securities (cash equivalents)
 
$
3,695
  
$
—
  
$
—
  
$
3,695
 

  
Level 1
  
Level 2
  
Level 3
  
Total
December 31, 2015
 
Equity securities 
 
$
56
  
$
—
  
$
—
  
$
56
 
U.S. Treasury securities (cash equivalents)
 
$
4,089
  
$
—
  
$
—
  
$
4,089