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Government Assistance - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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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