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Currency Risk - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
Foreign Currency Risk [Abstract]
Percentage of depreciation USD against Canadian dollar	10.00%
Increase in net loss currency risk	$ 0.1

X

- Definition

Foreign currency risk.

+ References

No definition available.

+ Details

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X

- Definition

Percentage of depreciation USD against Canadian dollar.

+ References

No definition available.

+ Details

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Namespace Prefix:	rptx_
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X

- Definition

Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of foreign currency derivatives not designated as hedging instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959

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