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Commitments and Contingencies - Additional Information (Detail) - USD ($) |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Aug. 08, 2019 | Feb. 29, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Mar. 13, 2019 | Jan. 16, 2019
James K. Sims |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |
Employment agreement expiration period | Feb. 09, 2020 |  |  |  |  |  |
Office Space Lease Agreement | Subsequent Event |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |
Operating lease maturity year |  | 2025 |  |  |  |  |
Additional lease payment |  | $ 3,200,000 |  |  |  |  |
Additional lease payment one to three years |  | 1,212,000 |  |  |  |  |
Additional lease payment three to five years |  | 1,300,000 |  |  |  |  |
Additional lease payment after five years |  | $ 600,000 |  |  |  |  |
Minimum | James K. Sims |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |
Contingent Severance cost |  |  |  |  |  | $ 400,000 |
Minimum | President, Chief Financial Officer and Secretary and Senior Vice President |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |
Contingent Severance cost |  |  |  |  |  |  | $ 455,000
Office Space and Research Facilities Lease |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |
Operating leases, rent expense |  |  | $ 973,000 | $ 912,000 | $ 805,000 |  |
Lease agreement description |  |  | The San Diego facility lease agreement included a tenant improvement allowance which provided for the landlord to pay for tenant improvements on behalf of the Company up to $515,000. Based on the terms of this landlord incentive and involvement of the Company in the construction process, the leasehold improvements purchased under the landlord incentive were determined to be property of the Company. |  |  |  |
Lease expiration date |  |  | Nov. 30, 2024 |  |  |  |
Office Space and Research Facilities Lease | Maximum |  |  |  |  |  |  |
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |
Payments for tenant improvements allowance |  |  | $ 515,000 |  |  |  |

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