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Fair Value Measurements - Additional Information (Details)	Jun. 30, 2021 USD ($)
Fair Value Disclosures [Abstract]
Fair value, assets, transfers between levels	$ 0

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- Definition

Fair value, assets, transfers between all levels.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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