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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
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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
Name: | dvax_NumberOfCommonStockPreferredStockConvertibleInto
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
Name: | dvax_PreferredStockConversionPricePerShare
Namespace Prefix: | dvax_
Data Type: | num:perShareItemType
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
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_CommonStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_CounterpartyNameAxis=dvax_BainLifeSciencesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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