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Leases - Summary of Maturities of Operating Lease Liabilities (parenthetical) (Detail) $ in Millions | Dec. 31, 2023 USD ($)
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Operating Leased Assets [Line Items] |
Lease obligations not yet commenced | $ 26.8
Minimum [Member] |
Operating Leased Assets [Line Items] |
Lease obligation terms | 5 years
Maximum [Member] |
Operating Leased Assets [Line Items] |
Lease obligation terms | 10 years

X
- Definition Lease obligations not yet commenced. + References No definition available. + Details
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Namespace Prefix: | rgen_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Term of lessee's operating lease not yet commenced, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-3 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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: |