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Commitments and Contingencies - Additional Information (Detail) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Loss Contingencies [Line Items]
Unoccupied facility expense		$ 77,000us-gaap_BusinessExitCosts1
Rent expense, net	500,000us-gaap_OperatingLeasesRentExpenseNet	400,000us-gaap_OperatingLeasesRentExpenseNet
Deferred rent	500,000us-gaap_DeferredRentCredit		600,000us-gaap_DeferredRentCredit
Future payments obligation	16,400,000us-gaap_LongTermPurchaseCommitmentAmount
Berkeley, California (the "Berkeley Lease")
Loss Contingencies [Line Items]
Operating leases expiration date	2018-06
Unoccupied facility expense			$ 400,000us-gaap_BusinessExitCosts1 / us-gaap_LeaseArrangementTypeAxis = dvax_BerkeleyLeaseMember	$ 900,000us-gaap_BusinessExitCosts1 / us-gaap_LeaseArrangementTypeAxis = dvax_BerkeleyLeaseMember
Dusseldorf, Germany (the "Dusseldorf Lease")
Loss Contingencies [Line Items]
Operating leases expiration date	2023-03

X

- Definition

Lease expiration, month and year.

+ References

No definition available.

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- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Includes, but is not limited to, one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and termination benefits associated with an ongoing benefit arrangement. Excludes expenses associated with special or contractual termination benefits, a discontinued operation or an asset retirement obligation.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

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

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

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-Name Accounting Standards Codification

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-Section S99

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-Subparagraph (SAB TOPIC 5.P.4(b))

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 5.P.3)

-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section P

-Subsection 3, 4

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- Definition

The cumulative difference between the rental payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense over the term of the leased property by the lessor or lessee, respectively.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 25

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=7501430&loc=d3e39896-112707

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X

- Definition

The minimum amount the entity agreed to spend under the long-term purchase commitment.

+ References

No definition available.

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- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

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