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Summary of Cash, Cash Equivalents and Marketable Securities Available-for-Sale (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	$ 97,585us-gaap_AvailableForSaleSecuritiesAmortizedCost	$ 122,651us-gaap_AvailableForSaleSecuritiesAmortizedCost
Unrealized Gains	12us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	11us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Unrealized Losses	(3)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	(10)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Estimated Fair Value	97,594us-gaap_AvailableForSaleSecurities	122,652us-gaap_AvailableForSaleSecurities
Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	14,713us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_CashAndCashEquivalentsMember	49,511us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_CashAndCashEquivalentsMember
Estimated Fair Value	14,713us-gaap_AvailableForSaleSecurities / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_CashAndCashEquivalentsMember	49,511us-gaap_AvailableForSaleSecurities / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_CashAndCashEquivalentsMember
Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	82,872us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember	73,140us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember
Unrealized Gains	12us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember	11us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember
Unrealized Losses	(3)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember	(10)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember
Estimated Fair Value	82,881us-gaap_AvailableForSaleSecurities / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember	73,141us-gaap_AvailableForSaleSecurities / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember
Cash | Cash and Cash Equivalents
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	2,145us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_InvestmentTypeAxis = us-gaap_CashMember	2,522us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_InvestmentTypeAxis = us-gaap_CashMember
Estimated Fair Value	2,145us-gaap_AvailableForSaleSecurities / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_InvestmentTypeAxis = us-gaap_CashMember	2,522us-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	12,568us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember	46,989us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember
Estimated Fair Value	12,568us-gaap_AvailableForSaleSecurities / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember	46,989us-gaap_AvailableForSaleSecurities / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember
U.S. Government Agency Securities | Marketable Securities Available-for-Sale
Cash Cash Equivalents And Marketable Securities [Line Items]
Amortized Cost	82,872us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember	73,140us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Unrealized Gains	12us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember	11us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Unrealized Losses	(3)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember	(10)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Estimated Fair Value	$ 82,881us-gaap_AvailableForSaleSecurities / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember	$ 73,141us-gaap_AvailableForSaleSecurities / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember

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