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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Operating Loss Carryforwards [Line Items] |  |
Valuation allowances recognized in the current year | $ 9,200,000 | $ 2,900,000
Internal Revenue Code related to annual use of operating loss carry forwards | annual use of the Company’s net operating loss and research and development credit carryforwards may be limited in the event a cumulative change in ownership of more than 50% occurs within a rolling three-year period |
Income tax benefit recognized related to uncertain tax positions | $ 0 | 0
Interest expense related to uncertain tax positions | 0 | 0
Liability related to unrecognized tax benefits | 0 | $ 0
Domestic Tax Authority |  |
Operating Loss Carryforwards [Line Items] |  |
Net operating loss carryforwards | 389,100,000 |
Operating loss carryforwards, not subject to expiration | 41,300,000 |
Research and development tax credit carryforwards | 10,200,000 |
California Franchise Tax Board |  |
Operating Loss Carryforwards [Line Items] |  |
Net operating loss carryforwards | 44,000,000.0 |
Research and development tax credit carryforwards | 12,100,000 |
Foreign Tax Authority |  |
Operating Loss Carryforwards [Line Items] |  |
Net operating loss carryforwards | $ 50,200,000 |

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