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Summary of Information Regarding Option Activity (Parenthetical) (Detail) (Employee Stock Option) | Mar. 31, 2014
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Awards Granted to Non-Executive Level Employees |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Estimated forfeiture rates | 8.00%
Awards Granted to Executive Level Employees |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Estimated forfeiture rates | 3.00%

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- Definition Percentage of Shares Subject to Forfeiture + References No definition available. + Details
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Namespace Prefix: | rgen_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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