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Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2013

Fair Value Measurements

Schedule of assets and liabilities measured on a recurring basis, at fair value

The major categories of assets and liabilities measured on a recurring basis, at fair value, as of September 30, 2013 and December 31, 2012, are as follows (in thousands):

		September 30, 2013
		Level 1			Level 2			Level 3			Total
United States treasuries		$	180,161		$	—		$	—		$	180,161
Commercial paper		—			11,943			—			11,943
Corporate bonds		—			74,721			—			74,721
Government agency securities		—			62,663			—			62,663
Total		$	180,161		$	149,327		$	—		$	329,488
		December 31, 2012
		Level 1			Level 2			Level 3			Total
United States treasuries		$	278,698		$	—		$	—		$	278,698
Government agency securities		—			123,054			—			123,054
Total		$	278,698		$	123,054		$	—		$	401,752

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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

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