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Government Assistance - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Research And Development [Abstract]
Reduction of research and development expenditures	$ 909	$ 566

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- Definition

increase decrease in research and development tax credits receivable.

+ References

No definition available.

+ Details

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Namespace Prefix:	rptx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- References

No definition available.

+ Details

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