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Summary of Cash, Cash Equivalents and Available-for-sale Marketable Securities (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Cash, cash equivalents and marketable securities [Line Items]
Amortized Cost	$ 160,229	$ 113,964
Unrealized Gains	7	9
Unrealized Losses	(37)	(12)
Estimated Fair Value	160,199	113,961
Cash and Cash Equivalents
Cash, cash equivalents and marketable securities [Line Items]
Amortized Cost	34,530	31,943
Unrealized Losses		(2)
Estimated Fair Value	34,530	31,941
Cash and Cash Equivalents | Cash
Cash, cash equivalents and marketable securities [Line Items]
Amortized Cost	2,001	2,290
Estimated Fair Value	2,001	2,290
Cash and Cash Equivalents | Money market funds
Cash, cash equivalents and marketable securities [Line Items]
Amortized Cost	26,352	17,171
Estimated Fair Value	26,352	17,171
Cash and Cash Equivalents | US Government Agencies Debt Securities
Cash, cash equivalents and marketable securities [Line Items]
Amortized Cost	6,177	9,438
Estimated Fair Value	6,177	9,438
Cash and Cash Equivalents | Corporate Debt Securities, Secured by U.S. Government
Cash, cash equivalents and marketable securities [Line Items]
Amortized Cost		3,044
Unrealized Losses		(2)
Estimated Fair Value		3,042
Available-for-sale Securities
Cash, cash equivalents and marketable securities [Line Items]
Amortized Cost	125,699	82,021
Unrealized Gains	7	9
Unrealized Losses	(37)	(10)
Estimated Fair Value	125,669	82,020
Available-for-sale Securities | US Government Agencies Debt Securities
Cash, cash equivalents and marketable securities [Line Items]
Amortized Cost	98,764	26,488
Unrealized Gains	7
Unrealized Losses	(34)	(6)
Estimated Fair Value	98,737	26,482
Available-for-sale Securities | Corporate Debt Securities, Secured by U.S. Government
Cash, cash equivalents and marketable securities [Line Items]
Amortized Cost	26,935	55,533
Unrealized Gains		9
Unrealized Losses	(3)	(4)
Estimated Fair Value	$ 26,932	$ 55,538

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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-Publisher FASB

-Name Accounting Standards Codification

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 19

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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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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-Publisher FASB

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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