Restatement of Previously Issued Financial Statements - Additional Information (Detail) $ in Millions	3 Months Ended
Mar. 31, 2023 USD ($)
Accounting Changes and Error Corrections [Abstract]
Cancelled purchase orders in exchange for one time cash payment	$ 17.3
Payment as component for product revenue	$ 17.3

Cancelled purchase orders in exchange for payment.

No definition available.

Name:	rgen_CancelledPurchaseOrdersInExchangeForPayment
Namespace Prefix:	rgen_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration