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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
NGL Impact A [Member] | Research and Development Arrangement [Member] |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |
Payments to Navigo in connection with this program, which are recorded to research and development expenses | $ 0.5 | $ 0.2 | $ 1.3 | $ 0.4

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- Definition Commitments and Contingencies [Line Items] + References No definition available. + Details
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Namespace Prefix: | rgen_
Data Type: | xbrli:stringItemType
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- Definition The minimum amount the entity agreed to spend under the long-term purchase commitment. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |