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Loan Agreements - Fair Value of Preferred Stock Warrants Calculated using Black-Scholes Assumptions (Detail) (Loan and Security Agreement with Lighthouse Capital Partners VI, L.P. [Member], Series D Convertible Preferred Stock [Member]) | 1 Months Ended
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Aug. 31, 2012 | Mar. 31, 2012 | Dec. 31, 2011
Loan and Security Agreement with Lighthouse Capital Partners VI, L.P. [Member] | Series D Convertible Preferred Stock [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |
Contractual life | 9 years 3 months 15 days | 9 years 8 months 9 days | 10 years
Expected volatility | 80.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember | 80.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember | 80.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember
Risk-free interest rate | 1.68%us-gaap_FairValueAssumptionsRiskFreeInterestRate / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember | 2.17%us-gaap_FairValueAssumptionsRiskFreeInterestRate / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember | 1.98%us-gaap_FairValueAssumptionsRiskFreeInterestRate / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember

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- Definition Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Risk-free interest rate assumption used in valuing an instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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