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Long-Term Debt - Additional Information (Detail) (USD $) | 12 Months Ended |  |
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Dec. 31, 2014 | Dec. 23, 2014 | Sep. 30, 2015
Debt Instrument [Line Items] |  |  |
Debt instrument, interest rate | 9.75%us-gaap_DebtInstrumentInterestRateEffectivePercentage |  |
Debt instrument, interest rate terms | The interest rate for each tranche in the Loan Agreement is calculated at a rate equal to the greater of either (i) 9.75% plus the prime rate as reported from time to time in The Wall Street Journal minus 5.25%, and (ii) 9.75% |  |
Debt instrument, payment terms | Payments under the Loan Agreement are interest only until February 1, 2016 (which will be extended until August 1, 2016, if we achieve Milestone A on or before September 30, 2015, and which will be extended until February 1, 2017, if we meet certain additional HEPLISAV-B Phase 3 related milestones (“Milestone B”) on or before August 1, 2016). The interest only period will be followed by equal monthly payments of principal and interest amortized over a 30 month schedule through the scheduled maturity date on July 1, 2018 (which would be extended through January 1, 2019 if we achieve Milestone A on or before September 30, 2015 or Milestone B on or before August 1, 2016) (the “Loan Maturity Date”). |  |
Debt instrument, maturity date | Jul. 01, 2018 |  |
Debt instrument, extension date | Jan. 01, 2019 |  |
Final minimum repayment of debt | $ 2,400,000 us-gaap_ProceedsFromRepaymentsOfDebt |  |
Advance payment on loan agreement | 40,000,000 dvax_AdvancePaymentOnLoanAgreement |  |
Facility charge to Hercules | 400,000 us-gaap_DebtIssuanceCosts |  |
Prime Rate |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, interest rate | 9.75%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_VariableRateAxis = us-gaap_PrimeRateMember |  |
Debt instrument, basis spread on variable rate | 5.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_VariableRateAxis = us-gaap_PrimeRateMember |  |
First Tranche |  |  |
Debt Instrument [Line Items] |  |  |
Final minimum repayment of debt | 840,000 us-gaap_ProceedsFromRepaymentsOfDebt / us-gaap_DebtInstrumentAxis = dvax_FirstTrancheMember |  |
Advance payment on loan agreement | 10,000,000 dvax_AdvancePaymentOnLoanAgreement / us-gaap_DebtInstrumentAxis = dvax_FirstTrancheMember |  |
Hercules Technology Growth Capital, Inc. (“Hercules”) |  |  |
Debt Instrument [Line Items] |  |  |
Debt under Loan Agreement | 40,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_CounterpartyNameAxis = dvax_HerculesTechnologyGrowthCapitalIncMember |  |
Number of tranches for loan and security agreement | 2 dvax_NumberOfTranchesForLoanAndSecurityAgreement / us-gaap_CounterpartyNameAxis = dvax_HerculesTechnologyGrowthCapitalIncMember |  |
Maximum capacity of subsequent financing | 1,500,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CounterpartyNameAxis = dvax_HerculesTechnologyGrowthCapitalIncMember |  |
Debt instrument prepayment charge | 1.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_CounterpartyNameAxis = dvax_HerculesTechnologyGrowthCapitalIncMember |  |
Outstanding borrowings | 10,000,000 us-gaap_LineOfCredit / us-gaap_CounterpartyNameAxis = dvax_HerculesTechnologyGrowthCapitalIncMember |  |
Carrying value debt | 9,600,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_CounterpartyNameAxis = dvax_HerculesTechnologyGrowthCapitalIncMember |  |
Debt instrument, discount of the facility charge | 400,000 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_CounterpartyNameAxis = dvax_HerculesTechnologyGrowthCapitalIncMember |  |
Debt instrument commitment fee | 45,000 us-gaap_DebtInstrumentFeeAmount / us-gaap_CounterpartyNameAxis = dvax_HerculesTechnologyGrowthCapitalIncMember |  |
Hercules Technology Growth Capital, Inc. (“Hercules”) | First Tranche |  |  |
Debt Instrument [Line Items] |  |  |
Debt under Loan Agreement |  | 10,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_CounterpartyNameAxis = dvax_HerculesTechnologyGrowthCapitalIncMember / us-gaap_DebtInstrumentAxis = dvax_FirstTrancheMember |
Hercules Technology Growth Capital, Inc. (“Hercules”) | Second Tranche | Scenario Forecast |  |  |
Debt Instrument [Line Items] |  |  |
Debt under Loan Agreement |  |  | $ 30,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_CounterpartyNameAxis = dvax_HerculesTechnologyGrowthCapitalIncMember / us-gaap_DebtInstrumentAxis = dvax_SecondTrancheMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember

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- Definition Debt instrument extension date. + References No definition available. + Details
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- Definition Number of tranches for loan and security agreement. + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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- Definition Amount of the fee that accompanies borrowing money under the debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Description of the payment terms of the debt instrument (for example, whether periodic payments include principal and frequency of payments) and discussion about any contingencies associated with the payment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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- Definition Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees). + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The net cash inflow or outflow in aggregate debt due to repayments and proceeds from additional borrowings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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