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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
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Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | $ 122,651 us-gaap_AvailableForSaleSecuritiesAmortizedCost | $ 189,407 us-gaap_AvailableForSaleSecuritiesAmortizedCost
Unrealized Gains | 11 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax | 16 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Unrealized Losses | (10)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax | (47)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Estimated Fair Value | 122,652 us-gaap_AvailableForSaleSecurities | 189,376 us-gaap_AvailableForSaleSecurities
Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 49,511 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_CashAndCashEquivalentsMember | 23,122 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_CashAndCashEquivalentsMember
Estimated Fair Value | 49,511 us-gaap_AvailableForSaleSecurities / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_CashAndCashEquivalentsMember | 23,122 us-gaap_AvailableForSaleSecurities / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_CashAndCashEquivalentsMember
Marketable Securities Available-for-Sale |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 73,140 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember | 166,285 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember
Unrealized Gains | 11 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember | 16 us-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 | 73,141 us-gaap_AvailableForSaleSecurities / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember | 166,254 us-gaap_AvailableForSaleSecurities / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember
Cash | Cash and Cash Equivalents |  |
Cash Cash Equivalents And Marketable Securities [Line Items] |  |
Amortized Cost | 2,522 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_InvestmentTypeAxis = us-gaap_CashMember | 1,766 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_InvestmentTypeAxis = us-gaap_CashMember
Estimated Fair Value | 2,522 us-gaap_AvailableForSaleSecurities / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_InvestmentTypeAxis = us-gaap_CashMember | 1,766 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 | 46,989 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember | 20,013 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember
Estimated Fair Value | 46,989 us-gaap_AvailableForSaleSecurities / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember | 20,013 us-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 |  | 1,343 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Estimated Fair Value |  | 1,343 us-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 | 73,140 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember | 166,285 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Unrealized Gains | 11 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember | 16 us-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 | $ 73,141 us-gaap_AvailableForSaleSecurities / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember | $ 166,254 us-gaap_AvailableForSaleSecurities / us-gaap_InformationByFinancialStatementLineItemAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember

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- Definition 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 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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