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Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2013

Financial Instruments And Marketable 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:

March 31, 2013:	Total				Level 1			Level 2			Level 3
Common stock	$	417			417			—			—
Total available-for-sale securities	$	417			417			—			—

December 31, 2012:	Total				Level 1			Level 2			Level 3
Common stock	$	354			354			—			—
Total available-for-sale securities	$	354			354			—			—

March 31, 2012:	Total				Level 1			Level 2			Level 3
Common stock	$	347			347			—			—
Government and agency securities	26,847				26,847			—			—
Total available-for-sale securities	$	27,194			27,194			—			—

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

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

March 31, 2013:	Amortized cost				Gross unrealized gains			Gross unrealized losses			Fair value
Common stock	$	197			220			—			417
Total available-for-sale securities	$	197			220			—			417

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

March 31, 2012:	Amortized cost				Gross unrealized gains			Gross unrealized losses			Fair value
Common stock	$	197			150			—			347
Government and agency securities	26,857				—			(10	)		26,847
Total available-for-sale securities	$	27,054			150			(10	)		27,194

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
March 31, 2013:	Amortized cost				Fair value			Amortized cost			Fair value
Common stock	$	197			417			—			—
Total available-for-sale securities	$	197			417			—			—

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- 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 6

-Footnote 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19190-110258



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

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Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments.

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Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value.

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