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Commitments and Contingencies - Additional Information (Detail) - USD ($)		1 Months Ended		3 Months Ended
	Sep. 07, 2016	Feb. 28, 2018	Nov. 30, 2009	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Loss Contingencies [Line Items]
Rent expense						$ 700,000	$ 600,000
Deferred rent						$ 800,000		$ 600,000
Maximum borrowing capacity		$ 175,000,000
Principal amount including interest paid in kind		$ 100,200,000
Debt maturity date		Dec. 31, 2023
Litigation settlement agreement date						September 7, 2016
Symphony Dynamo Holdings LLC
Loss Contingencies [Line Items]
License arrangement contingent consideration percentage			50.00%
License arrangement upfront payment			$ 50,000,000
Milestone payments						$ 0
Dynavax Technologies Securities Litigation
Loss Contingencies [Line Items]
Litigation amount payable	$ 4,100,000
Sublicense Agreement | Merck, Sharp & Dohme Corp.
Loss Contingencies [Line Items]
Payment upon obligation		$ 7,000,000
Scenario, Forecast | Sublicense Agreement | Merck, Sharp & Dohme Corp.
Loss Contingencies [Line Items]
Payment upon obligation				$ 7,000,000	$ 7,000,000
Berkeley, California (the "Berkeley Lease")
Loss Contingencies [Line Items]
Operating leases expiration date						2025-12
Dusseldorf, Germany (the "Dusseldorf Lease")
Loss Contingencies [Line Items]
Operating leases expiration date						2023-03

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