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Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2012

Fair Value Hierarchy for Financial Assets Measured at Fair Value on a Recurring Basis

The following table represents the fair value hierarchy for our financial assets measured at fair value on a recurring basis as of June 30, 2012 and December 31, 2011 (in thousands):

		Level 1				Level 2				Level 3				Total
June 30, 2012:
Money market funds		$	26,352			$	—			$	—			$	26,352
U.S. government agency securities			—				104,914				—				104,914
Corporate debt securities, secured by U.S. government			—				26,932				—				26,932
Total		$	26,352			$	131,846			$	—			$	158,198
December 31, 2011:
Money market funds		$	17,171			$	—			$	—			$	17,171
U.S. Government agency securities			—				35,920				—				35,920
Corporate debt securities, secured by U.S. government			—				58,580				—				58,580
Total		$	17,171			$	94,500			$	—			$	111,671

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- Definition

Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, 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 Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 1

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

+ Details

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