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Cash, Cash Equivalents and Marketable Securities

6 Months Ended

Jun. 30, 2012

Cash, Cash Equivalents and Marketable Securities [Abstract]

Cash, Cash Equivalents and Marketable Securities

Note 3. 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

We did not realize any gains or losses on our investments in marketable securities during the second quarter and first half of 2012 or 2011. To date we have not recorded any impairment charges on marketable securities related to other-than-temporary declines in market value.

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

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- Definition

The entire disclosure of cash, cash equivalents, and debt and equity securities, including any unrealized or realized gain (loss).

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