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Long Lived Assets by Geographic Area (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Long Lived Assets | $ 74,400 | $ 32,354
North America |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Long Lived Assets | 66,756 | 26,344
Europe |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Long Lived Assets | 6,775 | 5,162
APAC |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Long Lived Assets | $ 869 | $ 848

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- Definition The amount of total non-current assets excluding deferred tax assets. + References No definition available. + Details
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Namespace Prefix: | rgen_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_
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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: |

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