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Fair Value Measurement (Tables)
12 Months Ended
Dec. 31, 2012
Fair Value Disclosures [Abstract]  
Schedule of financial assets and liabilities measured at fair value on recurring basis
Financial assets measured at fair value on a recurring basis are summarized below:
 
 
Fair Value Measurements as of December 31, 2012
 
Total
 
Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
U.S. Treasury securities
$
18,298

 
$
18,298

 
$

 
$

Trading securities investment
42

 
42

 

 

Total financial assets measured at fair value
$
18,340

 
$
18,340

 
$

 
$

 
 
Fair Value Measurements as of December 31, 2011
 
Total
 
Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
U.S. Treasury securities
$
18,015

 
$
18,015

 
$

 
$

Trading securities investment
52

 
52

 

 

Total financial assets measured at fair value
$
18,067

 
$
18,067

 
$

 
$

Schedule of non-financial assets and liabilities measured at fair value on non-recurring basis