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

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

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