Name:	glgi_DefinedContributionPlanEmployerMatchingContributionPercentOfEmployeesGrossPayTrancheOne
Namespace Prefix:	glgi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

No definition available.

Name:	glgi_DefinedContributionPlanEmployerMatchingContributionPercentOfEmployeesGrossPayTrancheTwo
Namespace Prefix:	glgi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Percentage employer matches of the employee's percentage contribution matched, tranche one.

No definition available.

Name:	glgi_DefinedContributionPlanEmployerMatchingContributionPercentOfMatchTrancheOne
Namespace Prefix:	glgi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Percentage employer matches of the employee's percentage contribution matched, tranche two.

No definition available.

Name:	glgi_DefinedContributionPlanEmployerMatchingContributionPercentOfMatchTrancheTwo
Namespace Prefix:	glgi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Period of vesting under defined contribution plan.

No definition available.

Name:	glgi_DefinedContributionPlanVestingPeriod
Namespace Prefix:	glgi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Amount of cost for defined contribution plan.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 70
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480794/715-70-50-1

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

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

No definition available.

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Percentage of employer's matching contributions to a defined contribution plan that vests in a given year.

No definition available.

Name:	us-gaap_DefinedContributionPlanEmployersMatchingContributionAnnualVestingPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

No definition available.