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Revenue Recognition - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018
Other Revenues [Line Items] |  |
Impairment losses on receivables | $ 0 | $ 0

X
- Definition Impairment loss on receivables. + References No definition available. + Details
Name: | rgen_ImpairmentLossOnReceivables
Namespace Prefix: | rgen_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Other revenues. + References No definition available. + Details
Name: | rgen_OtherRevenuesLineItems
Namespace Prefix: | rgen_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration