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Summary of Revenue Recognized under Various Agreements (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended			12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2011
Product Information [Line Items]
Performance of research activities		$ 8,000us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized	$ 5,400us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized	$ 3,000us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized
Total revenues	627us-gaap_Revenues		3,498us-gaap_Revenues
Grant revenue	148us-gaap_RevenueFromGrants		1,125us-gaap_RevenueFromGrants
National Institute of Allergy and Infectious Diseases
Product Information [Line Items]
Grant revenue			874us-gaap_RevenueFromGrants / us-gaap_CounterpartyNameAxis = dvax_NationalInstituteOfAllergyAndInfectiousDiseasesMember
National Institutes of Health
Product Information [Line Items]
Grant revenue	148us-gaap_RevenueFromGrants / us-gaap_CounterpartyNameAxis = dvax_NationalInstitutesOfHealthMember		251us-gaap_RevenueFromGrants / us-gaap_CounterpartyNameAxis = dvax_NationalInstitutesOfHealthMember
Astra Zeneca
Product Information [Line Items]
Initial payment	63us-gaap_DeferredRevenueAdditions / us-gaap_TypeOfArrangementAxis = dvax_AstraZenecaMember		180us-gaap_DeferredRevenueAdditions / us-gaap_TypeOfArrangementAxis = dvax_AstraZenecaMember
Subsequent payment	237dvax_SubsequentPayment / us-gaap_TypeOfArrangementAxis = dvax_AstraZenecaMember		675dvax_SubsequentPayment / us-gaap_TypeOfArrangementAxis = dvax_AstraZenecaMember
Performance of research activities	171us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized / us-gaap_TypeOfArrangementAxis = dvax_AstraZenecaMember		887us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized / us-gaap_TypeOfArrangementAxis = dvax_AstraZenecaMember
Total revenues	$ 471us-gaap_Revenues / us-gaap_TypeOfArrangementAxis = dvax_AstraZenecaMember		$ 1,742us-gaap_Revenues / us-gaap_TypeOfArrangementAxis = dvax_AstraZenecaMember

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Amount of deferred revenue recognized for transactions arising during the current reporting period. Deferred revenue is a liability as of the balance sheet date related to a revenue producing activity for which revenue has not yet been recognized. Generally, an Entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 605

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 13.A.4(a).Q1)

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Staff Accounting Bulletin (SAB)

-Number Topic 13

-Section A

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Revenue earned during the period from non-repayable sum of money awarded to an entity to carry out a specific purpose as provided in grant agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(e))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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The amount of consideration recognized during the period for the milestone or milestones.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 605

-SubTopic 28

-Section 50

-Paragraph 2

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=19771982&loc=SL6892177-166501

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Topic 225

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-Section S99

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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