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Summary of Cash, Cash Equivalents and Marketable Securities Available-for-sale (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Cash, cash equivalents and marketable securities [Line Items]
Amortized Cost	$ 105,336	$ 125,085
Unrealized Gains	37	46
Unrealized Losses		(1)
Estimated Fair Value	105,373	125,130
Cash and Cash Equivalents
Cash, cash equivalents and marketable securities [Line Items]
Amortized Cost	25,016	7,599
Estimated Fair Value	25,016	7,599
Cash and Cash Equivalents | Cash
Cash, cash equivalents and marketable securities [Line Items]
Amortized Cost	2,567	1,542
Estimated Fair Value	2,567	1,542
Cash and Cash Equivalents | Money market funds
Cash, cash equivalents and marketable securities [Line Items]
Amortized Cost	18,783	3,140
Estimated Fair Value	18,783	3,140
Cash and Cash Equivalents | US Government Agencies Debt Securities
Cash, cash equivalents and marketable securities [Line Items]
Amortized Cost	2,201	2,202
Estimated Fair Value	2,201	2,202
Cash and Cash Equivalents | US Treasury Securities
Cash, cash equivalents and marketable securities [Line Items]
Amortized Cost	750
Estimated Fair Value	750
Cash and Cash Equivalents | Municipal Securities
Cash, cash equivalents and marketable securities [Line Items]
Amortized Cost	715	715
Estimated Fair Value	715	715
Available-for-sale Securities
Cash, cash equivalents and marketable securities [Line Items]
Amortized Cost	80,320	117,486
Unrealized Gains	37	46
Unrealized Losses		(1)
Estimated Fair Value	80,357	117,531
Available-for-sale Securities | US Government Agencies Debt Securities
Cash, cash equivalents and marketable securities [Line Items]
Amortized Cost	77,821	116,986
Unrealized Gains	36	46
Unrealized Losses		(1)
Estimated Fair Value	77,857	117,031
Available-for-sale Securities | US Treasury Securities
Cash, cash equivalents and marketable securities [Line Items]
Amortized Cost	2,499	500
Unrealized Gains	1
Estimated Fair Value	$ 2,500	$ 500

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FAS115-1/124-1

-Paragraph 7

-Footnote 2

-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.



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-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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- 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558



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-Paragraph 12

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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.



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Available-for-Sale Securities

-URI http://asc.fasb.org/extlink&oid=6505594

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 22

-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 Accounting Standards Codification

-Topic 320

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-Section 50

-Paragraph 2

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-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563



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