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Subsequent Events - Additional Information (Detail) - Emeryville, California (Premises) - Subsequent Event	Jul. 31, 2019 USD ($) ft²
Powell Street Sublease
Subsequent Event [Line Items]
Lease area | ft²	23,976
Base rent per square feet | $	$ 3.90
Lease expiration date	Jun. 30, 2022
Horton Street Sublease
Subsequent Event [Line Items]
Lease area | ft²	75,662
Base rent per square feet | $	$ 5.50
Lease expiration date	Mar. 31, 2031

X

- Definition

Base rent per square feet.

+ References

No definition available.

+ Details

Name:	dvax_BaseRentPerSquareFeet
Namespace Prefix:	dvax_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Opearting lease rent area.

+ References

No definition available.

+ Details

Name:	dvax_OpeartingLeaseRentArea
Namespace Prefix:	dvax_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Date which lease or group of leases is set to expire, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

Name:	us-gaap_LeaseExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
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_LeaseArrangementTypeAxis=dvax_PowellStreetSubleaseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=stpr_CA
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:

X

- Details

Name:	us-gaap_LeaseArrangementTypeAxis=dvax_HortonStreetSubleaseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: