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Investments and Fair Value Measurement - Schedule of Investments (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 62,335	$ 73,262
Gross Unrealized Gains	26	26
Gross Unrealized (Losses)
Estimated Fair Value	62,361	73,288
Cash equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9,758	18,836
Gross Unrealized Gains
Gross Unrealized (Losses)
Estimated Fair Value	9,758	18,836
Available-for-sale securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	52,577	54,426
Gross Unrealized Gains	26	26
Gross Unrealized (Losses)
Estimated Fair Value	52,603	54,452
Money market funds [Member] | Cash equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9,758	15,839
Gross Unrealized Gains
Gross Unrealized (Losses)
Estimated Fair Value	9,758	15,839
U.S. government sponsored entity debt securities [Member] | Cash equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		2,997
Gross Unrealized Gains
Gross Unrealized (Losses)
Estimated Fair Value		2,997
U.S. government sponsored entity debt securities [Member] | Available-for-sale securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	52,577	54,426
Gross Unrealized Gains	26	26
Gross Unrealized (Losses)
Estimated Fair Value	$ 52,603	$ 54,452

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

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-Name Accounting Standards Codification

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-Section 50

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

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