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Fair Value of Financial Instruments (Details 3) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Fair Value	Dec. 31, 2012 Fair Value	Jun. 30, 2013 Fair Value Certificates of deposit	Dec. 31, 2012 Fair Value Certificates of deposit	Jun. 30, 2013 Fair Value Corporate notes	Dec. 31, 2012 Fair Value Corporate notes	Jun. 30, 2013 Fair Value U.S. government debt securities	Dec. 31, 2012 Fair Value U.S. government debt securities	Jun. 30, 2013 Level 1	Dec. 31, 2012 Level 1	Jun. 30, 2013 Level 2	Dec. 31, 2012 Level 2	Jun. 30, 2013 Level 2 Certificates of deposit	Dec. 31, 2012 Level 2 Certificates of deposit	Jun. 30, 2013 Level 2 Corporate notes	Dec. 31, 2012 Level 2 Corporate notes	Jun. 30, 2013 Level 2 U.S. government debt securities	Dec. 31, 2012 Level 2 U.S. government debt securities
Fair value hierarchy for its financial assets
Money market funds			$ 4,126	$ 1,407							$ 4,126	$ 1,407
Available-for-sale securities					5,952	467	18,699	16,226	29,574	22,289					5,952	467	18,699	16,226	29,574	22,289
Total assets			58,351	40,389							4,126	1,407	54,225	38,982
Transfer of assets between Level 1 to Level 2	0	0
Transfer of liabilities between Level 1 to Level 2	0	0
Transfer of assets between Level 2 to Level 1	0	0
Transfer of liabilities between Level 2 to Level 1	$ 0	$ 0

X

- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

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Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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