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Summary of Significant Accounting Policies - Long Lived Assets by Geographic Area (Detail) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Segment Reporting, Asset Reconciling Item [Line Items]
Long Lived Assets	$ 311,065	$ 333,984
North America
Segment Reporting, Asset Reconciling Item [Line Items]
Long Lived Assets	257,408	284,868
Europe
Segment Reporting, Asset Reconciling Item [Line Items]
Long Lived Assets	47,393	45,650
APAC
Segment Reporting, Asset Reconciling Item [Line Items]
Long Lived Assets	$ 6,264	$ 3,466

X

- 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

X

- 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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=srt_EuropeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=rgen_APACMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: