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v2.4.1.9

Preferred Stock, Common Stock and Warrants - Additional Information (Detail) (USD $) | 0 Months Ended | 1 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Nov. 04, 2008 | Oct. 31, 2013 | Dec. 31, 2013 | Nov. 10, 2014 | Dec. 31, 2014
Preferred Stock Common Stock And Warrants [Line Items] |  |  |  |  |
Preferred stock, shares authorized |  |  | 5,000,000 us-gaap_PreferredStockSharesAuthorized |  | 5,000,000 us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares outstanding |  |  |  |  | 43,430 us-gaap_PreferredStockSharesOutstanding
Issuance of common stock, net of issuance costs (in shares) |  | 7,957,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues |  |  |
Preferred stock, par value | $ 0.001 us-gaap_PreferredStockParOrStatedValuePerShare |  | 0.001 us-gaap_PreferredStockParOrStatedValuePerShare |  | $ 0.001 us-gaap_PreferredStockParOrStatedValuePerShare
Public offering net price per share |  | $ 1.075 us-gaap_EquityIssuancePerShareAmount |  |  |
Common stock, par value | $ 0.001 us-gaap_CommonStockParOrStatedValuePerShare |  | 0.001 us-gaap_CommonStockParOrStatedValuePerShare |  | $ 0.001 us-gaap_CommonStockParOrStatedValuePerShare
Dividends payable date | Nov. 17, 2008 |  |  |  |
Preferred shares price | $ 6.00 us-gaap_SharePrice |  |  |  |
Rights expiration date | Nov. 17, 2018 |  |  |  |
Warrants to purchase common stock |  |  |  |  | 1,100,000 dvax_WarrantToPurchaseCommonStock
Warrants exercise price |  |  |  |  | $ 15.00 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Number Of Warrants Exercised During Period |  |  | 25,000 dvax_NumberOfWarrantsExercisedDuringPeriod |  | 11,000 dvax_NumberOfWarrantsExercisedDuringPeriod
Common Stock |  |  |  |  |
Preferred Stock Common Stock And Warrants [Line Items] |  |  |  |  |
Issuance of common stock, net of issuance costs (in shares) |  |  | 7,957,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Gross proceeds from issuance of stock |  | $ 85,500,000 us-gaap_ProceedsFromIssuanceOrSaleOfEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Issuance costs |  | 4,500,000 us-gaap_PaymentsOfStockIssuanceCosts / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Net proceeds from offering |  | 80,900,000 us-gaap_ProceedsFromIssuanceInitialPublicOffering / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Minimum |  |  |  |  |
Preferred Stock Common Stock And Warrants [Line Items] |  |  |  |  |
Percentage of common shares outstanding | 20.00%dvax_PercentageOfCommonSharesOutstanding / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |
Percentage of assets | 50.00%dvax_PercentageOfCompanyAssets / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |
Maximum | Cowen |  |  |  |  |
Preferred Stock Common Stock And Warrants [Line Items] |  |  |  |  |
Common stock sales agreement aggregate sales proceeds |  |  |  | 50,000,000 dvax_CommonStockSalesAgreementAggregateSalesProceeds / us-gaap_CounterpartyNameAxis = dvax_CowenMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
Commission on gross sales proceeds of common stock |  |  |  | 3.00%dvax_SellingCommissionPercentageFromGrossOfferingProceedsOfSalesOfStock / us-gaap_CounterpartyNameAxis = dvax_CowenMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
Series B Convertible Preferred Stock |  |  |  |  |
Preferred Stock Common Stock And Warrants [Line Items] |  |  |  |  |
Preferred stock, shares outstanding |  |  | 43,430 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_ConvertiblePreferredStockMember |  | 43,430 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_ConvertiblePreferredStockMember
Issuance of common stock, net of issuance costs (in shares) |  | 43,430 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_ConvertiblePreferredStockMember |  |  |
Preferred stock, par value |  | $ 0.001 us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_ConvertiblePreferredStockMember |  |  |
Public offering net price per share |  | $ 1.075 us-gaap_EquityIssuancePerShareAmount / us-gaap_StatementClassOfStockAxis = us-gaap_ConvertiblePreferredStockMember |  |  |
Gross proceeds from issuance of stock |  | 46,700,000 us-gaap_ProceedsFromIssuanceOrSaleOfEquity / us-gaap_StatementClassOfStockAxis = us-gaap_ConvertiblePreferredStockMember |  |  |
Issuance costs |  | 2,500,000 us-gaap_PaymentsOfStockIssuanceCosts / us-gaap_StatementClassOfStockAxis = us-gaap_ConvertiblePreferredStockMember |  |  |
Net proceeds from offering |  | 44,200,000 us-gaap_ProceedsFromIssuanceInitialPublicOffering / us-gaap_StatementClassOfStockAxis = us-gaap_ConvertiblePreferredStockMember |  |  |
Convertible common stock shares |  |  |  |  | 100 us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion / us-gaap_StatementClassOfStockAxis = us-gaap_ConvertiblePreferredStockMember
Convertible preferred stock, terms of conversion |  |  |  |  | The holder is prohibited from converting the Series B Convertible Preferred Stock into shares of common stock if, as a result of such conversion, the holder and its affiliates would own more than 9.98% of the total number of shares of common stock then issued and outstanding.
Convertible preferred stock, settlement terms |  |  |  |  | In the event of the Company’s liquidation, dissolution, or winding up, holders of Series B Convertible Preferred Stock will receive a payment equal to $0.001 per share before any proceeds are distributed to the common stockholders.
Maximum percentage of shares of common stock issued and outstanding from conversion of preferred stock |  |  |  |  | 9.98%dvax_MaximumPercentageOfSharesOfCommonStockIssuedAndOutstandingFromConversionOfPreferredStock / us-gaap_StatementClassOfStockAxis = us-gaap_ConvertiblePreferredStockMember
Convertible common stock exceeded allocated purchase price of preferred stock |  |  |  |  | $ 8,500,000 dvax_FairValueOfAllocatedCommonStockExceededConvertiblePreferredStockPurchasePriceOnDateOfIssuance / us-gaap_StatementClassOfStockAxis = us-gaap_ConvertiblePreferredStockMember

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