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Subsequent Event - Additional Information (Detail)	Nov. 03, 2017 USD ($)
Maximum | At the Market Sales Agreement | Subsequent Event
Subsequent Event [Line Items]
Common stock sales agreement aggregate sales proceeds	$ 150,000,000

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- Definition

Common stock sales agreement aggregate sales proceeds.

+ References

No definition available.

+ Details

Name:	dvax_CommonStockSalesAgreementAggregateSalesProceeds
Namespace Prefix:	dvax_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=dvax_AtTheMarketSalesAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: