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Equity Plans and Stock-Based Compensation - Additional Information (Detail) - USD ($) |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
May 28, 2020 | May 30, 2019 | May 31, 2018 | May 28, 2014 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 31, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Outstanding stock awards granted |  |  |  |  | 8,505,000 | 8,006,000 |  |
Total intrinsic value of options exercised |  |  |  |  | $ 100,000 | $ 26,000 | $ 200,000 |
Total fair value of stock options vested |  |  |  |  | 13,800,000 | 19,500,000 | 8,100,000 |
Stock-based compensation expense |  |  |  |  | $ 13,484,000 | 25,456,000 | 23,478,000 |
Expected dividend yield |  |  |  |  | 0.00% |  |  |
Increase in aggregate number of shares of common stock authorized for issuance |  |  | 600,000 |  |  |  |  |
Restructuring |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  |  | 4,122,000 |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock based compensation expense related to restricted stock |  |  |  |  | $ 4,900,000 |  |  |
Aggregate intrinsic value |  |  |  |  | 8,000,000.0 |  |  |
Total fair value of restricted stock units |  |  |  |  | $ 4,900,000 | $ 7,900,000 | 19,400,000 |
Restricted stock unit awards outstanding |  |  |  |  | 1,794,000 | 1,784,000 |  |
Employee Stock Option |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Outstanding stock awards granted |  |  |  |  | 117,000 |  |  |
Performance Based Vesting Condition |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Restricted stock unit awards outstanding |  |  |  |  | 247,000 |  |  |
Stock-based compensation expense |  |  |  |  | $ 100,000 | $ 500,000 | $ 1,900,000 |
Maximum | Employee Stock Option |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Expiration period |  |  |  |  | 10 years |  |  |
Options vesting period |  |  |  |  | 3 years |  |  |
Minimum | Employee Stock Option |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Expiration period |  |  |  |  | 7 years |  |  |
Options vesting period |  |  |  |  | 4 years |  |  |
2018 Equity Incentive Plan |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Newly reserved shares of common stock |  |  | 5,000,000 |  |  |  |  |
Shares remaining available for future purchases |  |  | 140,250 |  |  |  |  |
Outstanding stock awards granted |  |  | 7,477,619 |  |  |  |  |
Expiration period |  |  | 7 years |  |  |  |  |
Shares reserved and approved for issuance |  |  |  |  | 8,349,853 |  |  |
2018 Equity Incentive Plan | Maximum |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares remaining available for future purchases |  |  | 12,617,869 |  |  |  |  |
Amended 2018 Equity Incentive Plan |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Newly reserved shares of common stock | 7,600,000 | 2,300,000 |  |  |  |  |  |
Shares remaining available for future purchases |  | 22,517,869 |  |  |  |  |  |
Dynavax Technologies Corporation 2021 Inducement Award Plan [Member] | Subsequent Event |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance |  |  |  |  |  |  |  | 1,500,000
Time Based Vesting Schedule |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Total unrecognized compensation cost related to non-vested equity awards |  |  |  |  | $ 15,900,000 |  |  |
Total unrecognized compensation cost, weighted-average vesting period |  |  |  |  | 1 year 9 months 18 days |  |  |
Performance Based Vesting Schedule |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Total unrecognized compensation cost related to non-vested equity awards |  |  |  |  | $ 1,200,000 |  |  |
2014 Employee Stock Purchase Plan |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Total unrecognized compensation cost related to non-vested equity awards |  |  |  |  | $ 200,000 |  |  |
Total unrecognized compensation cost, weighted-average vesting period |  |  |  |  | 1 year |  |  |
Shares issued to employees |  |  |  |  | 195,334 |  |  |
Shares remaining available for future purchases |  |  |  |  | 255,583 |  |  |
2014 Employee Stock Purchase Plan | The commencement of the offer period (generally, the sixteenth day in February or August) |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Purchase price per share as percentage of fair market value of common stock |  |  |  | 85.00% |  |  |  |
2014 Employee Stock Purchase Plan | The exercise date, which is the last day of a purchase period (generally, the fifteenth day in February or August) |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Purchase price per share as percentage of fair market value of common stock |  |  |  | 85.00% |  |  |  |

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