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Marketable Securities
 6 Months Ended
Jun. 30, 2013
Financial Instruments And Marketable Securities [Abstract]  
Marketable Securities
(2) Marketable Securities
We follow a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets and liabilities (Level 1) and the lowest priority to measurements involving unobservable inputs (Level 3). The three levels of the fair value hierarchy are as follows:
•
Level 1 inputs are observable inputs that reflect quoted prices (unadjusted) for identical assets or liabilities in active markets.
•
Level 2 inputs include other inputs that are directly or indirectly observable in the marketplace.
•
Level 3 inputs are unobservable inputs which are supported by little or no market activity.
The level in the fair value hierarchy within which a fair value measurement falls is based on the lowest level input that is significant to the fair value measurement in its entirety.
 
The following table presents the placement in the fair value hierarchy of assets that are measured at fair value on a recurring basis:
 
June 30, 2013:
Total
 
Level 1
 
Level 2
 
Level 3
Common stock
$
437

 
437

 
—

 
—

Total available-for-sale securities
$
437

 
437

 
—

 
—

 
December 31, 2012:
Total
 
Level 1
 
Level 2
 
Level 3
Common stock
$
354

 
354

 
—

 
—

Total available-for-sale securities
$
354

 
354

 
—

 
—

 
June 30, 2012:
Total
 
Level 1
 
Level 2
 
Level 3
Common stock
$
310

 
310

 
—

 
—

Government and agency securities
26,856

 
26,856

 
—

 
—

Total available-for-sale securities
$
27,166

 
27,166

 
—

 
—


There were no transfers between levels during the six and three month periods ended June 30, 2013 and 2012.
As of June 30, 2013, December 31, 2012, and June 30, 2012, our financial assets that are measured at fair value on a recurring basis consisted of common stock and debt securities.


Marketable securities, all treated as available-for-sale securities, consist of the following:
 
June 30, 2013:
Amortized
cost
 
Gross
unrealized
gains
 
Gross
unrealized
losses
 
Fair value
Common stock
$
197

 
240

 
—

 
437

Total available-for-sale securities
$
197

 
240

 
—

 
437

 
December 31, 2012:
Amortized
cost
 
Gross
unrealized
gains
 
Gross
unrealized
losses
 
Fair value
Common stock
$
197

 
157

 
—

 
354

Total available-for-sale securities
$
197

 
157

 
—

 
354

 
June 30, 2012:
Amortized
cost
 
Gross
unrealized
gains
 
Gross
unrealized
losses
 
Fair value
Common stock
$
197

 
113

 
—

 
310

Government and agency securities
26,862

 
—

 
(6
)
 
26,856

Total available-for-sale securities
$
27,059

 
113

 
(6
)
 
27,166


The unrealized gains and losses recorded in accumulated other comprehensive income and the realized gains and losses recorded in earnings were immaterial during the periods reported in these consolidated financial statements.
Future maturities of our available-for-sale securities consist of the following:
 
 
Less than 12 months
 
Greater than 12 months
June 30, 2013:
Amortized
cost
 
Fair
value
 
Amortized
cost
 
Fair
value
Common stock
$
197

 
437

 
—

 
—

Total available-for-sale securities
$
197

 
437

 
—

 
—