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Income Taxes - Summary of Losses Expire (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)
Income Tax Disclosure [Abstract]
2039	$ 11,395
2038	7,053
2037	750
Total	$ 19,198

X

- Definition

Income tax losses.

+ References

No definition available.

+ Details

Name:	rptx_IncomeTaxLosses
Namespace Prefix:	rptx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Income tax losses expire four.

+ References

No definition available.

+ Details

Name:	rptx_IncomeTaxLossesExpireFour
Namespace Prefix:	rptx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Income tax losses expire three.

+ References

No definition available.

+ Details

Name:	rptx_IncomeTaxLossesExpireThree
Namespace Prefix:	rptx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Income tax losses expire two.

+ References

No definition available.

+ Details

Name:	rptx_IncomeTaxLossesExpireTwo
Namespace Prefix:	rptx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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