Fair Value Disclosures (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Inputs used in measuring fair value of assets and liabilities
Available-for-sale marketable securities	$ 0	$ 2,079
Total	0	2,079
Government-sponsored securities [Member]
Inputs used in measuring fair value of assets and liabilities
Available-for-sale marketable securities	0	993
Corporate debt securities [Member]
Inputs used in measuring fair value of assets and liabilities
Available-for-sale marketable securities	0	1,086
Quoted Prices in Active Markets for Identical Assets, Level 1 [Member]
Inputs used in measuring fair value of assets and liabilities
Total	0	721
Quoted Prices in Active Markets for Identical Assets, Level 1 [Member] \| Government-sponsored securities [Member]
Inputs used in measuring fair value of assets and liabilities
Available-for-sale marketable securities	0
Quoted Prices in Active Markets for Identical Assets, Level 1 [Member] \| Corporate debt securities [Member]
Inputs used in measuring fair value of assets and liabilities
Available-for-sale marketable securities	0	721
Significant Other Observable Inputs, Level 2 [Member]
Inputs used in measuring fair value of assets and liabilities
Total	0	1,358
Significant Other Observable Inputs, Level 2 [Member] \| Government-sponsored securities [Member]
Inputs used in measuring fair value of assets and liabilities
Available-for-sale marketable securities	0	993
Significant Other Observable Inputs, Level 2 [Member] \| Corporate debt securities [Member]
Inputs used in measuring fair value of assets and liabilities
Available-for-sale marketable securities	0	365
Significant Unobservable Inputs, Level 3 [Member]
Inputs used in measuring fair value of assets and liabilities
Total	0
Significant Unobservable Inputs, Level 3 [Member] \| Government-sponsored securities [Member]
Inputs used in measuring fair value of assets and liabilities
Available-for-sale marketable securities	0
Significant Unobservable Inputs, Level 3 [Member] \| Corporate debt securities [Member]
Inputs used in measuring fair value of assets and liabilities
Available-for-sale marketable securities	$ 0

- Definition

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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