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Subsequent Event - Additional Information (Detail) - Series C Convertible Preferred Stock - Common Stock - Bain Life Sciences - Subsequent Event	Mar. 11, 2020 $ / shares shares
Subsequent Event [Line Items]
Number of common stock allowed to purchase | shares	1,000
Conversion price per share | $ / shares	$ 4.50

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- Definition

Number of common stock preferred stock convertible into.

+ References

No definition available.

+ Details

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Namespace Prefix:	dvax_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

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- Definition

Preferred stock conversion price per share.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

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- 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

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Details

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- Details

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Namespace Prefix:
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Period Type:

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- Details

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Namespace Prefix:
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- Details

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