Operating lease liabilities excluding control not conveyed leases.

No definition available.

Name:	rgen_OperatingLeaseLiabilitiesExcludingControlNotConveyedLeases
Namespace Prefix:	rgen_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Area of land held.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfLand
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479041/842-20-45-1

+ Details

Name:	us-gaap_OperatingLeaseLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of lessee's right to use underlying asset under operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479041/842-20-45-1

+ Details

Name:	us-gaap_OperatingLeaseRightOfUseAsset
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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

Name:	us-gaap_OperatingLeasedAssetsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_GeographicDistributionAxis=rgen_ShrewsburyLeaseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_GeographicDistributionAxis=rgen_RanchoDominguezLeaseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Leases - Additional Information (Detail) $ in Thousands	Dec. 31, 2024 USD ($)	Dec. 01, 2024 USD ($) ft²	Feb. 01, 2024 USD ($) ft²	Dec. 31, 2023 USD ($)
Operating Leased Assets [Line Items]
Operating lease right of use assets	$ 135,378			$ 115,515
Operating lease liabilities	160,680			132,200
Operating lease liabilities excluding control not conveyed leases	$ 160,680			$ 132,209
Shrewsbury lease [Member]
Operating Leased Assets [Line Items]
Operating lease right of use assets			$ 13,700
Expansion of existing premises \| ft²			139,000
Rancho Dominguez Lease [Member]
Operating Leased Assets [Line Items]
Operating lease right of use assets		$ 13,000
Expansion of existing premises \| ft²		72,000