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Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended	12 Months Ended
	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) Segment	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jan. 01, 2019 USD ($)
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Number of operating segment | Segment		1
Cash, cash equivalents and marketable securities		$ 151,100,000
Impairment of Intangible assets		0	$ 0	$ 0
Accelerated depreciation related to certain long-lived assets	$ 3,000,000.0	3,000,000.0
Right-of-use asset		30,252,000
Operating lease, liability		40,884,000
Goodwill impairment		$ 0	$ 0	$ 0
ASC 842
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Right-of-use asset					$ 34,800,000
Operating lease, liability					$ 37,100,000
Credit Concentration Risk
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Concentration risk, customer		three largest customers	three largest customers
Trade Receivable | Credit Concentration Risk
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Concentration risk, percentage		76.00%	71.00%
Product | Revenue | Credit Concentration Risk
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Concentration risk, percentage		62.00%	68.00%
United States
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]
Percentage of revenue earned		100.00%	83.00%	90.00%
Percentage of long lived assets		62.00%	24.00%
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]
Currency translation adjustments		$ (500,000)	$ (1,100,000)	$ 2,800,000
Currency transaction gain (loss)		$ 200,000	$ 300,000	$ (600,000)

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