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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) | 1 Months Ended | 6 Months Ended |  |
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May 31, 2020 USD ($) $ / shares shares | Aug. 31, 2019 USD ($) | Jun. 30, 2020 USD ($) Segment shares | Dec. 31, 2019 shares | Jun. 30, 2019 USD ($)
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |
Number of operating segment | Segment |  |  | 1 |  |
Cash, cash equivalents and marketable securities |  |  | $ 200,700,000 |  |
Principal amount including interest paid in kind |  |  | $ 180,900,000 |  |
Debt maturity date |  |  | Dec. 31, 2023 |  |
Common stock, shares issued | shares |  |  | 109,503,000 | 83,871,000 |
Inventory reserve |  |  | $ 0 |  | $ 0
Maximum |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |
Expected period of payment to be received |  |  | 1 year |  |
Public Offering |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |
Common stock, shares issued | shares | 16,100,000 |  |  |  |
Proceeds from issuance initial public offering | $ 75,400,000 | $ 65,600,000 |  |  |
Sale of stock, price per share | $ / shares | $ 5.00 |  |  |  |
HEPLISAV-B® |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |
Minimum age approved for vaccine prevention of infection caused |  |  | 18 years |  |

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