Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2012

Investments, Debt and Equity Securities [Abstract]

Fair Value Hierarchy of Assets Measured on Recurring Basis

The following table presents the placement in the fair value hierarchy of assets that are measured at fair value on a recurring basis at period end:



September 30, 2012:	Total		Level 1	Level 2	Level 3
Common stock	$	360	360	—	—
Government and agency securities	26,868		26,868	—	—
Total available-for-sale securities	$	27,228	27,228	—	—



December 31, 2011:	Total		Level 1	Level 2	Level 3
Common stock	$	320	320	—	—
Government and agency securities	26,845		26,845	—	—
Total available-for-sale securities	$	27,165	27,165	—	—



September 30, 2011:	Total		Level 1	Level 2	Level 3
Common stock	$	295	295	—	—
Government and agency securities	25,908		25,908	—	—
Total available-for-sale securities	$	26,203	26,203	—	—

Summary of Marketable Securities Treated as Available-for-Sale Securities

Marketable securities, all treated as available-for-sale securities at period end, consist of the following:



September 30, 2012:	Amortized cost		Gross unrealized gains	Gross unrealized losses	Fair value
Common stock	$	197	163	—	360
Government and agency securities	26,868		—	—	26,868
Total available-for-sale securities	$	27,065	163	—	27,228



December 31, 2011:	Amortized cost		Gross unrealized gains	Gross unrealized losses		Fair value
Common stock	$	197	123	—		320
Government and agency securities	26,851		—	(6	)	26,845
Total available-for-sale securities	$	27,048	123	(6	)	27,165



September 30, 2011:	Amortized cost		Gross unrealized gains	Gross unrealized losses	Fair value
Common stock	$	198	97	—	295
Government and agency securities	25,850		58	—	25,908
Total available-for-sale securities	$	26,048	155	—	26,203

Summary of Future Maturities of Available-For-Sale Securities

Future maturities of our available-for-sale securities consist of the following:



	Less than 12 months			Greater than 12 months
September 30, 2012:	Amortized cost		Fair value	Amortized cost	Fair value
Common stock	$	197	360	—	—
Government and agency securities	26,868		26,868	—	—
Total available-for-sale securities	$	27,065	27,228	—	—

- Definition

Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References+ Details