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Stockholders' Equity - Additional Information (Detail) (USD $) | 3 Months Ended | 0 Months Ended | 1 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Feb. 26, 2015 | Apr. 16, 2015 | May 31, 2014 | Jan. 31, 2014 | Dec. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Options vesting period | 4 years |  |  |  |  |  |
Expiration period | 10 years |  |  |  |  |  |
Stock-based compensation expense | $ 1,954,000 us-gaap_AllocatedShareBasedCompensationExpense | $ 1,270,000 us-gaap_AllocatedShareBasedCompensationExpense |  |  |  |  |
Warrants to purchase common stock | 1,060,000 dvax_WarrantToPurchaseCommonStock |  |  |  |  |  |
Warrants exercise price | $ 15 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 |  |  |  |  |  |
Warrants expiration date | Apr. 16, 2015 |  |  |  |  |  |
Number of warrants exercised for issuance of common stock | 19,900 dvax_NumberOfWarrantsExercisedForIssuanceOfCommonStock |  |  |  |  |  |
Number of warrants exercised during a period | 7,500 dvax_NumberOfWarrantsExercisedDuringPeriod |  |  |  |  |  |
Preferred stock, shares authorized | 5,000,000 us-gaap_PreferredStockSharesAuthorized |  |  |  |  |  | 5,000,000 us-gaap_PreferredStockSharesAuthorized
Preferred stock, par value | $ 0.001 us-gaap_PreferredStockParOrStatedValuePerShare |  |  |  |  |  | $ 0.001 us-gaap_PreferredStockParOrStatedValuePerShare
Conversion of stock, shares converted |  |  | 26,000 us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion |  |  |  |
Series B Convertible Preferred Stock |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Preferred stock, shares outstanding | 17,430 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_ConvertiblePreferredStockMember |  |  |  |  |  |
Preferred stock, par value | $ 0.001 us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_ConvertiblePreferredStockMember |  |  |  |  |  |
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 |  |  |  |  |  |
Series B Convertible Preferred Stock |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Preferred stock, shares outstanding | 17,430 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |  | 43,000 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember
Conversion of stock, shares converted | 100 us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |  |
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. |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Conversion of stock, shares converted |  |  | 2,600,000 us-gaap_ConversionOfStockSharesConverted1 / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Subsequent Event |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Number of warrants exercised for issuance of common stock |  |  |  | 1,060,000 dvax_NumberOfWarrantsExercisedForIssuanceOfCommonStock / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
Number of warrants exercised during a period |  |  |  | 375,000 dvax_NumberOfWarrantsExercisedDuringPeriod / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
Warrants remained outstanding |  |  |  | 0 us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
Employee Stock Purchase Plan |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Shares reserved and approved for issuance | 99,600 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |  |  |  |  |  |
Shares issued to employees | 94,410 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesPurchasedForAward / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |  |  |  | 50,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesPurchasedForAward / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |  |
Shares remaining available for future purchases | 5,190 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |  |  |  |  |  |
Employee Stock Purchase Plan | The commencement of the offer period (generally, the fifteenth day in February or August |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Purchase price per share as percentage of fair market value of common stock |  |  |  |  |  | 85.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent / dvax_PeriodAxis = dvax_PeriodOneMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |
Employee Stock Purchase Plan | The exercise date, which is the last day of a purchase period (generally, the fourteenth day in February or August) |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Purchase price per share as percentage of fair market value of common stock |  |  |  |  |  | 85.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent / dvax_PeriodAxis = dvax_PeriodTwoMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |
2014 Employee Stock Purchase Plan |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Shares issued to employees | 7,959 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesPurchasedForAward / us-gaap_SubsidiarySaleOfStockAxis = dvax_TwoThousandAndFourteenEmployeeStockPurchasePlanMember |  |  |  |  |  |
Shares remaining available for future purchases | 42,041 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_SubsidiarySaleOfStockAxis = dvax_TwoThousandAndFourteenEmployeeStockPurchasePlanMember |  |  |  |  |  |
Time Based Vesting Schedule |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Total unrecognized compensation cost related to non-vested equity awards | 19,800,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_PlanNameAxis = dvax_TimeBasedVestingScheduleMember |  |  |  |  |  |
Total unrecognized compensation cost, weighted-average vesting period | 3 years 29 days |  |  |  |  |  |
Performance Based Vesting Schedule |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Total unrecognized compensation cost related to non-vested equity awards | 400,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_PlanNameAxis = dvax_PerformanceBasedVestingScheduleMember |  |  |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Aggregate intrinsic value | $ 4,400,000 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |  |  |
Performance based Vesting Condition |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Shares underlying stock options and restricted stock units awards with performance-based vesting criteria | 75,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |  |  |  |  |  |

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- Definition Period from grant date that an equity-based award expires, 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 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Purchase price of common stock expressed as a percentage of its fair value. + References No definition available. + Details
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- Definition The number of shares purchased on the open market during the period for issuance to employees under the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 + Details
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