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Cash, Cash Equivalents and Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2012

Cash, Cash Equivalents and Marketable Securities [Abstract]

Cash, cash equivalents and marketable securities

The following table summarizes our cash, cash equivalents and marketable securities (in thousands):

		Cash, Cash Equivalents and Marketable Securities
		Amortized Cost				Unrealized Gains				Unrealized Losses				Estimated Fair Value				Accrued Interest				Total Value
June 30, 2012
Cash and cash equivalents		$	28,886			$	—			$	—			$	28,886			$	—			$	28,886
Commercial paper			54,928				5				(1	)			54,932				—				54,932
Corporate securities			10,002				39				—				10,041				83				10,124
		$	93,816			$	44			$	(1	)		$	93,859			$	83			$	93,942
Reported as:
Cash and cash equivalents		$	79,017			$	3			$	—			$	79,020			$	—			$	79,020
Marketable securities			14,799				41				(1	)			14,839			$	83				14,922
		$	93,816			$	44			$	(1	)		$	93,859			$	83			$	93,942
Maturities:
Matures in one year or less		$	93,816			$	44			$	(1	)		$	93,859			$	83			$	93,942
Matures one to three years			—				—				—				—				—				—
		$	93,816			$	44			$	(1	)		$	93,859			$	83			$	93,942
December 31, 2011
Cash and cash equivalents		$	73,144			$	—			$	—			$	73,144			$	—			$	73,144
Corporate securities			24,583				128				—				24,711				276				24,987
		$	97,727			$	128			$	—			$	97,855			$	276			$	98,131
Reported as:
Cash and cash equivalents		$	73,144			$	—			$	—			$	73,144			$	—			$	73,144
Marketable securities			24,583				128				—				24,711				276				24,987
		$	97,727			$	128			$	—			$	97,855			$	276			$	98,131
Maturities:
Matures in one year or less		$	97,727			$	128			$	—			$	97,855			$	276			$	98,131
Matures one to three years			—				—				—				—				—				—
		$	97,727			$	128			$	—			$	97,855			$	276			$	98,131

Assets measured at fair value on a recurring basis

The following table presents our assets measured at fair value on a recurring basis (in thousands):

		Level 1				Level 2				Level 3				Total
June 30, 2012
Cash and money market fund		$	28,886			$	—			$	—			$	28,886
Commercial paper			—				54,932				—				54,932
Corporate securities			—				10,124				—				10,124
		$	28,886			$	65,056			$	—			$	93,942
December 31, 2011
Cash and money market fund		$	62,446			$	—			$	—			$	62,446
Commercial paper			—				10,698				—				10,698
Corporate securities			—				24,987				—				24,987
		$	62,446			$	35,685			$	—			$	98,131

X

- Definition

Cash cash equivalents and marketable securities.

+ References

No definition available.

+ Details

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X

- 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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