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Marketable Securities - Schedule of Investments (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014 | Dec. 31, 2013
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Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Cash and cash equivalents | $ 25,256 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 6,030 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 126,823 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 10,186 us-gaap_CashAndCashEquivalentsAtCarryingValue
Total cash equivalents | 17,089 us-gaap_CashAndCashEquivalentsFairValueDisclosure | 3,182 us-gaap_CashAndCashEquivalentsFairValueDisclosure |  |
Amortized Cost | 217,533 us-gaap_AvailableForSaleSecuritiesAmortizedCost | 223,399 us-gaap_AvailableForSaleSecuritiesAmortizedCost |  |
Gross Unrealized Gains | 32 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax | 33 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax |  |
Gross Unrealized (Losses) | (7)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax | (58)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax |  |
Estimated Fair Value | 217,558 us-gaap_AvailableForSaleSecurities | 223,374 us-gaap_AvailableForSaleSecurities |  |
Available-for-sale securities [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized Cost | 200,444 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember | 220,217 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember |  |
Gross Unrealized Gains | 32 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember | 33 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember |  |
Gross Unrealized (Losses) | (7)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember | (58)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember |  |
Estimated Fair Value | 200,469 us-gaap_AvailableForSaleSecurities / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember | 220,192 us-gaap_AvailableForSaleSecurities / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember |  |
Money market funds [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Cash and cash equivalents | 17,089 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember | 3,182 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember |  |
Total cash equivalents | 17,089 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember | 3,182 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember |  |
Cash equivalents [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Cash and cash equivalents | 17,089 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember | 3,182 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember |  |
Total cash equivalents | 17,089 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember | 3,182 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_InvestmentTypeAxis = us-gaap_CashEquivalentsMember |  |
Commercial paper securities [Member] | Available-for-sale securities [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized Cost | 31,121 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_CommercialPaperMember | 33,715 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_CommercialPaperMember |  |
Gross Unrealized Gains | 27 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_CommercialPaperMember | 33 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_CommercialPaperMember |  |
Estimated Fair Value | 31,148 us-gaap_AvailableForSaleSecurities / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_CommercialPaperMember | 33,748 us-gaap_AvailableForSaleSecurities / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_CommercialPaperMember |  |
Corporate debt securities [Member] | Available-for-sale securities [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized Cost | 23,261 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember | 22,831 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember |  |
Gross Unrealized Gains | 5 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember |  |  |
Gross Unrealized (Losses) |  | (18)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember |  |
Estimated Fair Value | 23,266 us-gaap_AvailableForSaleSecurities / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember | 22,813 us-gaap_AvailableForSaleSecurities / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember |  |
U.S. government sponsored entity debt securities [Member] | Available-for-sale securities [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Amortized Cost | 146,062 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember | 163,671 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember |  |
Gross Unrealized (Losses) | (7)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember | (40)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember |  |
Estimated Fair Value | $ 146,055 us-gaap_AvailableForSaleSecurities / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember | $ 163,631 us-gaap_AvailableForSaleSecurities / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember |  |

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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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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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