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CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - shares		9 Months Ended
	Sep. 16, 2021	Sep. 30, 2021
Avitide, Inc.
Shares of common stock issued for acquisition	271,096	271,096

X

- Definition

Number of shares of equity interests issued or issuable to acquire entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)(4)
-URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479

+ Details

Name:	us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=rgen_AvitideIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: