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Net Loss Per Share - Additional Information (Detail) - $ / shares		12 Months Ended
	Jul. 08, 2020	Dec. 31, 2020
Series C Preferred Stock [Member]
Earnings Per Share Basic [Line Items]
Preferred stock convertible conversion price	$ 3.027603	$ 3.21

X

- Definition

Preferred stock convertible conversion price.

+ References

No definition available.

+ Details

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Namespace Prefix:	rlay_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_SeriesCPreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: