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Summary of Cash, Cash Equivalents and Marketable Securities Available-for-Sale (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	$ 130,534	$ 189,407
Unrealized Gains	44	16
Unrealized Losses	(6)	(47)
Estimated Fair Value	130,572	189,376
Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	19,656	23,122
Estimated Fair Value	19,656	23,122
Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	110,878	166,285
Unrealized Gains	44	16
Unrealized Losses	(6)	(47)
Estimated Fair Value	110,916	166,254
Cash | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	1,683	1,766
Estimated Fair Value	1,683	1,766
Money Market Funds | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	17,973	20,013
Estimated Fair Value	17,973	20,013
U.S. Government Agency Securities | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost		1,343
Estimated Fair Value		1,343
U.S. Government Agency Securities | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	110,878	166,285
Unrealized Gains	44	16
Unrealized Losses	(6)	(47)
Estimated Fair Value	$ 110,916	$ 166,254

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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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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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