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Employee Benefit Plan - Additional Information (Detail)	Dec. 31, 2018
Postemployment Benefits [Abstract]
401(k) plan - Defined Contribution Plan, Sponsor Location [Extensible List]	country:US
401(k) plan - Defined Contribution Plan, Tax Status [Extensible List]	us-gaap:QualifiedPlanMember

X

- Definition

Indicates location of employer sponsoring defined contribution plan designed to provide retirement benefits.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanSponsorLocationExtensibleList
Namespace Prefix:	us-gaap_
Data Type:	srt-types:extensibleListItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Indicates tax status of defined contribution plan designed to provide retirement benefits.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanTaxStatusExtensibleList
Namespace Prefix:	us-gaap_
Data Type:	srt-types:extensibleListItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_PostemploymentBenefitsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration