401(k) Retirement Plan - Additional Information (Detail) - USD ($)	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019
Four Zero One K Retirement Plan [Member]
Employer contribution to defined benefit plan	$ 0	$ 0

Amount of discretionary contributions made by an employer to a defined contribution plan.

No definition available.

Name:	us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration