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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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