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Summary of Cash, Cash Equivalents and Marketable Securities Available-for-Sale (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	$ 122,651us-gaap_AvailableForSaleSecuritiesAmortizedCost	$ 189,407us-gaap_AvailableForSaleSecuritiesAmortizedCost
Unrealized Gains	11us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	16us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Unrealized Losses	(10)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	(47)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Estimated Fair Value	122,652us-gaap_AvailableForSaleSecurities	189,376us-gaap_AvailableForSaleSecurities
Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	49,511us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_CashAndCashEquivalentsMember	23,122us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_CashAndCashEquivalentsMember
Estimated Fair Value	49,511us-gaap_AvailableForSaleSecurities / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_CashAndCashEquivalentsMember	23,122us-gaap_AvailableForSaleSecurities / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_CashAndCashEquivalentsMember
Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	73,140us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember	166,285us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember
Unrealized Gains	11us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember	16us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember
Unrealized Losses	(10)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember	(47)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember
Estimated Fair Value	73,141us-gaap_AvailableForSaleSecurities / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember	166,254us-gaap_AvailableForSaleSecurities / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember
Cash | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	2,522us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_InvestmentTypeAxis = us-gaap_CashMember	1,766us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_InvestmentTypeAxis = us-gaap_CashMember
Estimated Fair Value	2,522us-gaap_AvailableForSaleSecurities / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_InvestmentTypeAxis = us-gaap_CashMember	1,766us-gaap_AvailableForSaleSecurities / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_InvestmentTypeAxis = us-gaap_CashMember
Money Market Funds | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	46,989us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember	20,013us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember
Estimated Fair Value	46,989us-gaap_AvailableForSaleSecurities / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember	20,013us-gaap_AvailableForSaleSecurities / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember
U.S. Government Agency Securities | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost		1,343us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Estimated Fair Value		1,343us-gaap_AvailableForSaleSecurities / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
U.S. Government Agency Securities | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	73,140us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember	166,285us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Unrealized Gains	11us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember	16us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Unrealized Losses	(10)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember	(47)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Estimated Fair Value	$ 73,141us-gaap_AvailableForSaleSecurities / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember	$ 166,254us-gaap_AvailableForSaleSecurities / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember

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

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