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Revenue Recognition - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018 USD ($)
Other Revenues [Line Items]
Impairment losses on receivables	$ 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