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Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2013

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

The following table represents the fair value hierarchy for our financial assets measured at fair value on a recurring basis as of March 31, 2013 and December 31, 2012 (in thousands):

		Level 1				Level 2				Level 3				Total
March 31, 2013
Money market funds		$	18,783			$	—			$	—			$	18,783
U.S. government agency securities			—				80,058				—				80,058
U.S. treasury securities			—				3,250				—				3,250
Municipal securities			—				715				—				715
Total		$	18,783			$	84,023			$	—			$	102,806
		Level 1				Level 2				Level 3				Total
December 31, 2012
Money market funds		$	3,140			$	—			$	—			$	3,140
U.S. government agency securities			—				119,233				—				119,233
U.S. treasury securities			—				500				—				500
Municipal securities			—				715				—				715
Total		$	3,140			$	120,448			$	—			$	123,588

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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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