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Summary of Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 USD ($) | Dec. 31, 2020 USD ($) Segment | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |
Number of operating segment | Segment |  | 1 |  |  |
Cash, cash equivalents and marketable securities |  | $ 165,000,000.0 |  |  |
Inventory reserves |  | 0 | $ 0 | $ 1,000,000.0 |
Impairment of Intangible assets |  | 0 | 0 | $ 0 |
Accelerated depreciation related to certain long-lived assets | $ 3,000,000.0 |  | 3,000,000.0 |  |
Goodwill impairment |  | $ 0 | $ 0 |  | $ 0
Credit Concentration Risk |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |
Concentration risk, customer |  | three largest customers | three largest customers | three largest customers |
Trade Receivable | Credit Concentration Risk |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |
Concentration risk, percentage |  | 86.00% | 76.00% |  |
Product | Revenue | Credit Concentration Risk |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |
Concentration risk, percentage |  | 61.00% | 62.00% | 68.00% |
HEPLISAV-B |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |
Increase in product revenue |  | $ 800,000 |  |  |
United States |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |
Percentage of revenue earned |  | 77.00% | 100.00% | 83.00% |
Percentage of long lived assets |  | 57.00% | 62.00% |  |
Maximum |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |
Cash equivalents original maturity period |  | 3 months |  |  |
Expected period of payment to be received |  | 1 year |  |  |
Dynavax GmbH |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |
Cumulative translation adjustment |  | $ 200 | $ (2,500) |  |
Currency translation adjustments |  | 2,700,000 | (500,000) | $ (1,100,000) |
Currency transaction gain (loss) |  | $ (800,000) | $ 200,000 | $ 300,000 |

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