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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
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Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | $ 97,585 us-gaap_AvailableForSaleSecuritiesAmortizedCost | $ 122,651 us-gaap_AvailableForSaleSecuritiesAmortizedCost
Unrealized Gains | 12 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax | 11 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Unrealized Losses | (3)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax | (10)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Estimated Fair Value | 97,594 us-gaap_AvailableForSaleSecurities | 122,652 us-gaap_AvailableForSaleSecurities
Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 14,713 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_CashAndCashEquivalentsMember | 49,511 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_CashAndCashEquivalentsMember
Estimated Fair Value | 14,713 us-gaap_AvailableForSaleSecurities / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_CashAndCashEquivalentsMember | 49,511 us-gaap_AvailableForSaleSecurities / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_CashAndCashEquivalentsMember
Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 82,872 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember | 73,140 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember
Unrealized Gains | 12 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember | 11 us-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 | 82,881 us-gaap_AvailableForSaleSecurities / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember | 73,141 us-gaap_AvailableForSaleSecurities / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember
Cash | Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 2,145 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_InvestmentTypeAxis = us-gaap_CashMember | 2,522 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_InvestmentTypeAxis = us-gaap_CashMember
Estimated Fair Value | 2,145 us-gaap_AvailableForSaleSecurities / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_InvestmentTypeAxis = us-gaap_CashMember | 2,522 us-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 | 12,568 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember | 46,989 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember
Estimated Fair Value | 12,568 us-gaap_AvailableForSaleSecurities / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember | 46,989 us-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 | 82,872 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember | 73,140 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Unrealized Gains | 12 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember | 11 us-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 | $ 82,881 us-gaap_AvailableForSaleSecurities / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember | $ 73,141 us-gaap_AvailableForSaleSecurities / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember

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