Marketable Securities

The Company has evaluated its investment policies and determined that all of its investment securities are to be classified as available-for-sale. Available-for-sale securities are carried at fair value, with the unrealized gains and losses reported in Stockholders' Equity under the caption "Accumulated other comprehensive loss." Realized gains and losses on available-for-sale securities are included in "Other income (expense)." There was no realized gain or loss on available-for-sale securities for both the three and six months ended June 30, 2011 and June 30, 2010, respectively. The Company records other-than-temporary impairment charges for its available-for-sale investments when it intends to sell the securities, it is more likely than not that it will be required to sell the securities before a recovery, or when it does not expect to recover the entire amortized cost basis of the securities. The cost of securities sold is based on the specific identification method.

As of June 30, 2011, the Company held one auction-rate security with a fair value of $259. The underlying asset of the Company's auction-rate security consisted of a municipal bond with an auction reset feature. Due to auction failures in the marketplace, the Company will not have access to these funds unless (a) future auctions occur and are successful, (b) the security is called by the issuer, (c) the Company sells the security in an available secondary market, or (d) the underlying note matures. Currently, there are no active secondary markets. As of June 30, 2011, the Company has recorded a cumulative temporary unrealized impairment loss of $241 within "Accumulated other comprehensive loss" based upon its assessment of the fair value of this security. The Company believes that this impairment is temporary as it does not intend to sell this security, the Company will not be required to sell this security before recovery, and the Company expects to recover the amortized cost basis of this security.

The Company has determined that the gross unrealized losses on its marketable securities at June 30, 2011 and December 31, 2010 are temporary in nature. The Company reviews its investment portfolio to identify and evaluate investments that have indications of possible impairment. Factors considered in determining whether a loss is other-than-temporary include the length of time and extent to which fair value has been less than the cost basis, credit quality and the Company's ability and intent to hold the investment for a period of time sufficient to allow for any anticipated recovery in market value.

At June 30, 2011 and December 31, 2010, marketable securities are categorized as follows:



	Amortized Cost		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses			Fair Value
June 30, 2011
Treasury notes and obligations of agencies	$	4,328	$	1	$	—		$	4,329
Tax-free auction rate securities	500		—		(241		)	259
Total marketable securities	$	4,828	$	1	$	(241	)	$	4,588
December 31, 2010
Treasury notes and obligations of agencies	$	359	$	3	$	—		$	362
Tax-free auction rate securities	500		—		(233		)	267
Total marketable securities	$	859	$	3	$	(233	)	$	629

The amortized cost and estimated fair value of marketable securities classified by the maturity date listed on the security, regardless of the Condensed Consolidated Balance Sheet classification, is as follows at June 30, 2011 and December 31, 2010:



	June 30, 2011				December 31, 2010
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Due within one year	$	4,328	$	4,329	$	359	$	362
Due after one through five years	—		—		—		—
Due after five through ten years	—		—		—		—
Due after ten years	500		259		500		267
Total marketable securities	$	4,828	$	4,588	$	859	$	629

The following table summarizes the estimated fair value and gross unrealized holding losses of marketable securities, aggregated by investment instrument and period of time in an unrealized loss position at June 30, 2011 and December 31, 2010. No amounts have been in an unrealized loss position for less than 12 months.



	In Unrealized Loss Position For Greater Than 12 Months
	Fair Value		Gross Unrealized Losses
June 30, 2011
Tax-free auction rate securities	$	259	$	(241	)
Total	$	259	$	(241	)
December 31, 2010
Tax-free auction rate securities	$	267	$	(233	)
Total	$	267	$	(233	)

See Note 3 for additional discussion regarding the fair value of the Company's marketable securities.