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Condensed Consolidated Statements of Cash Flows (Unaudited) (Parenthetical) $ in Thousands	9 Months Ended
	Sep. 30, 2021 USD ($)
Statement of Cash Flows [Abstract]
Underwriting commissions and discounts	$ 6,488

X

- Definition

Underwriting Commissions And Discounts

+ References

No definition available.

+ Details

Name:	rlyb_UnderwritingCommissionsAndDiscounts
Namespace Prefix:	rlyb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- References

No definition available.

+ Details

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