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Summary of Significant Accounting Policies - Schedule of Estimated Useful Life of Property Plant and Equipment (Details) (10-K)	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Computer Equipment and Software [Member]
Estimated useful life	5 years	5 years
Computer Equipment and Software [Member] | Successor [Member]
Estimated useful life		5 years
Office Equipment and Furniture [Member]
Estimated useful life	7 years	7 years
Office Equipment and Furniture [Member] | Successor [Member]
Estimated useful life		7 years
Leasehold Improvements [Member]
Estimated useful life description	Shorter of the useful life or the lease term
Leasehold Improvements [Member] | Successor [Member]
Estimated useful life description		Shorter of the useful life or the lease term
Software [Member]
Estimated useful life	3 years
Software [Member] | Successor [Member]
Estimated useful life		3 years

X

- Definition

Estimated useful life description.

+ References

No definition available.

+ Details

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Namespace Prefix:	RELI_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
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X

- Details

Name:	srt_StatementScenarioAxis=RELI_SuccessorsMember
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X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=RELI_OfficeEquipmentAndFurnitureMember
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Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LeaseholdImprovementsMember
Namespace Prefix:
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- Details

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Namespace Prefix:
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Balance Type:
Period Type: