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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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