Employee Retirement Plan - Additional Information (Detail) - USD ($) |
12 Months Ended | |
|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
|
| Compensation And Retirement Disclosure [Abstract] | ||
| Contributions made under Plan | $ 0 | $ 0 |
| Defined contribution plan, sponsor location [extensible list] | country:US | country:US |
| Defined contribution plan, tax status [extensible list] | us-gaap:QualifiedPlanMember | us-gaap:QualifiedPlanMember |