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Symphony Dynamo, Inc. - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended
	Nov. 30, 2009	Dec. 31, 2014	Apr. 18, 2006
SDI
Business Acquisition Equity Interests Issued Or Issuable [Line Items]
Investments in SDI			$ 50,000,000us-gaap_EquityMethodInvestments / dei_LegalEntityAxis = dvax_SymphonyDynamoIncMember
Ownership percentage by parent			100.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = dvax_SymphonyDynamoIncMember
Business acquisition contingent consideration percentage	50.00%dvax_BusinessAcquisitionContingentConsiderationPercentage / dei_LegalEntityAxis = dvax_SymphonyDynamoIncMember
Business acquisition upfront payment	50,000,000us-gaap_PaymentsToAcquireBusinessesGross / dei_LegalEntityAxis = dvax_SymphonyDynamoIncMember
Milestone payments		$ 0dvax_MilestonePayments / dei_LegalEntityAxis = dvax_SymphonyDynamoIncMember
Holdings
Business Acquisition Equity Interests Issued Or Issuable [Line Items]
Ownership percentage by parent			100.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = dvax_SymphonyDynamoHoldingsLlcMember

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- Definition

Business acquisition contingent consideration percentage.

+ References

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- Definition

Milestone payments.

+ References

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- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ 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 210.5-02.12)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570

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- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

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- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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